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Questions tagged [homework]

If your question is part of your high school or college/university homework, please use this tag. Do not use this as the only tag on a question. It signifies that instead of a direct answer, care should be taken to explaining the steps to the solution, preferably sticking to just giving helpful, conceptual hints. This tag may be applied to questions which are not homework but are similar to a homework problem.

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24 votes
3 answers
34k views

Why is there a seasonal cycle to the amount of CO2 in the atmosphere?

I'm doing some homework on the increase of $\mathrm{CO}_2$ in the atmosphere. On one of the graphs it shows the amount of $\mathrm{CO}_2$ peaks in May and has a low in November. Why is this? Shouldn't ...
Shannon Torstonson's user avatar
12 votes
1 answer
5k views

Lake inflow-outflow problem

The evaporation from a lake is to be calculated by the water balance method. Inflow to the lake occurs through three small rivers, A, B and C. The outflow occurs through the river D. Calculate ...
Kavya's user avatar
  • 129
10 votes
1 answer
275 views

Simplest formula of a calcium phosphate mineral?

I had a homework question: Given the formula: $$\ce{Ca}_x\ce{(PO4)}_y\ce{OH}$$ Find the lowest possible values of $x,y$ and state (look up) the mineral name. Based on the anion charges ...
Mecury-197's user avatar
9 votes
1 answer
2k views

A parcel of air in an isothermal layer

I'm having a bit of trouble figuring out a solution to this problem: There is an isothermal layer of air which has a temperature of 0 °C extending from the surface to 1 km height. A parcel is 0.5 °C ...
Sofia June's user avatar
8 votes
4 answers
372 views

How do I find the horizontal pressure level that divides the atmosphere into 2 layers of equal mass?

Surface pressure given is p = 1000 hPa. (the temperature along the atmosphere is constant (T = −10 °C; hydrostatic equilibrium assumed). I tried using the hypsometric equation to find the height of ...
n.mont's user avatar
  • 129
7 votes
3 answers
6k views

What is the shortest path between two points on Earth's surface?

I am a Math student and don't know about longitude and latitude. This question was asked in CSIR-NET Mathematics. Please help me to solve it. Two points $A$ and $B$ on the surface of the Earth have ...
Learner's user avatar
  • 173
7 votes
3 answers
931 views

Oxygen isotope ratio and Glaciers

The question is basically: During the Cretaceous there were no continental ice sheets. The ratio of O-18/O-16 in sea water was: a) Higher than today b) Lower than today The answer ...
gwhiz's user avatar
  • 181
7 votes
1 answer
401 views

How to calculate hydrostatic equilibrium?

I'm trying to solve the following problem. The sea level in the past was 200 m higher than today. The seawater became in isostatic equilibrium with the ocean basin. what is the increase in the depth $...
user1166251's user avatar
6 votes
2 answers
2k views

Interpreting a geological map

I have a homework question that I'm stuck on, I have attempted interpreting this map but am not sure if I have to correct interpretation. What is the youngest/oldest rock in the geological ...
Andrew Cavagnino's user avatar
6 votes
2 answers
1k views

Take all the CO2 in the atmosphere and put it into a layer on the surface of earth, how thick would the layer be?

I teach a Middle School (year 8) Geometry course and have a student attempting to answer this question. My assumptions: earth's radius is $3959 \text{ mi}$ earth is a sphere There is approximately $3 ...
Nick H's user avatar
  • 221
6 votes
1 answer
1k views

Plotting a mineral stability diagram

I'm trying to figure out how to plot the stability of 4 minerals — $\ce{CaCO3}$, $\ce{CaSO4}$, $\ce{CaMg(CO3)2}$, and $\ce{CaMg3(CO3)4}$ — with axes of $\mathrm{ln}\,a_{\ce{Mg^{+2}}}$ vs $\mathrm{ln}\,...
Mecury-197's user avatar
6 votes
1 answer
2k views

Maps and Faults

I'm having trouble determining the type of fault represented on this map. What type of fault is represented on this map? What is the fault orientation? What does this mean?, Do I do this by working ...
Andrew Cavagnino's user avatar
6 votes
1 answer
403 views

Define components of mineral assemblage?

Given the a mineral assemblage with the minerals $$cp (\ce{CuFeS_2}), bn (\ce{Cu_5FeS_4}), cc (\ce{Cu_2S}), mt (\ce{Fe_3O_4}), py(\ce{FeS_2})$$ where cp, bn, mt are in contact, and py, cp, bn, cc are ...
Mecury-197's user avatar
6 votes
1 answer
153 views

The environments of particular deposits

I came across this question in my text book: "During a visit to a mountainous area, students noticed a high mountain consists of 3 different parts: The top of the mountain consists of ...
Asmaa's user avatar
  • 585
6 votes
1 answer
155 views

Identifying trichroic crystal systems

An unknown mineral shows three distinct pleochroic colours. Explain what observations you need to make in order to decide which crystal system it belongs to. If it has three pleochroic colours this ...
bon's user avatar
  • 2,211
6 votes
0 answers
108 views

Dating fluvial terraces with $^{10}\rm{Be}$

I've completed part A of the question below. Dating fluvial terraces with $^{10}\rm{Be}$ One way to determine the age of an alluvial deposit is to collect a series of samples from a range of depths, ...
Justin Grant's user avatar
5 votes
3 answers
758 views

The fertility of the soil

I came across this question in my book, it says: The fertility of the soil increases when there is a lot of ....... in it. The choices to fill the space were: Nitrogen - nodular bacteria - ...
Asmaa's user avatar
  • 585
5 votes
2 answers
937 views

Number of tectonic plates

I came across a question asking what's the number of tectonic plates in this illustration: I don't know on which basis we count the tectonic plates. And I'm confused because I think they are 5 but ...
Eman5's user avatar
  • 51
5 votes
1 answer
23k views

How to calculate residence time for an element in a reservoir?

The residence time for an element in a reservoir can be calculated by the reservoir size at steady state divided by the inflow or outflow rate. Given the following diagram, I need to calculate the ...
yre's user avatar
  • 485
5 votes
1 answer
1k views

Calculating magnetic declination for a non-axial dipole field

I'm trying to answer the following question: Compute the inclination and declination of the magnetic field that would be observed in Boulder, Colorado (40°N, 105°W) if the Earth’s field ...
GeoSuper's user avatar
5 votes
1 answer
205 views

Carbon dioxide and ocean acidification based on temperature

For our assignment, we are required to analyse and compare the $\ce{CO2}$ level (in both ocean and air) of two different sites. Theoretically, shouldn't the $\ce{CO2}$ level of a colder region (e.g., ...
user avatar
5 votes
0 answers
103 views

Are there any books, websites, etc. that have many practice problems for Skew-T diagrams and the atmospheric sciences in general?

I am asking because my Intro to Atmospheric Science class (lectures, labs, and the book) has not provided any practice examples of Skew-T diagrams, Coriolis force calculations, LCL (liquid ...
mematusz's user avatar
4 votes
1 answer
502 views

A sedimentary rock with only minerals

In my text book I came across this multiple-choice question A sedimentary rock consists of only minerals and lacks fossils, it could be classified as: i) a clastic sedimentary rock ii) a chemical ...
Asmaa's user avatar
  • 585
4 votes
1 answer
2k views

How can I normalize this chemical analysis to a mineral with 3 cations?

$\ce{FeO}$ = 70 wt% $\ce{TiO2}$ = 30 wt% The molecular weight given of $\ce{FeO}$ = 72, and the mw of $\ce{TiO2}$ = 80. The first step I did was divide each wt% by their molecular weights to get a ...
nukenine's user avatar
  • 143
4 votes
1 answer
501 views

Relative dating of intrusion

I am quite new to geology and have a realtive dating problem which I am a bit unsure of. I know very well the principle of superposition, principle of cross-cutting, etc., but am still a little bit ...
Kristian's user avatar
  • 143
4 votes
1 answer
1k views

How and why humidity and vapour pressure change as a parcel of air with an unchanging amount of water vapor rises, expands, and cools

I know that a parcel of air can rise, cool and create clouds and rain but I'm struggling to understand how: absolute humidity relative humidity actual vapour pressure saturation vapour pressure ...
Elsa's user avatar
  • 141
4 votes
0 answers
376 views

Puzzle using relative dating principles

This isn't directly looking at a real life ecological example kind of thing, but it requires knowledge of relative dating, so I thought I would come here. Here is what was told: -"Worms" (curved ...
throwaway0555585's user avatar
3 votes
3 answers
5k views

How do I convert between different east longitude coordinates?

I have two datasets that represent longitude in different ways. The first represents longitude as degrees from east to 180, but then as negative east so that I have a series which looks like: ...
Emma Tebbs's user avatar
3 votes
2 answers
987 views

How to graph gravity as a function of depth, given radius and density?

I need to do this for a planet that has uniform density, and a planet that has two layers. For the first part, I was given that the density was 550 kg/m³, so I made one column in an Excel spreadsheet ...
spinelcity's user avatar
3 votes
1 answer
1k views

The free oxygen (O$_2$) in the atmosphere is largely a result of what process?

Does it come from a)atmospheric lightning and ozone dissociation. b)meteorite impacts early in the earth's geological history. c)Paleozoic volcanic activity. d)photosynthetic processes. e)...
Mikeayl Winters's user avatar
3 votes
1 answer
780 views

Help determining virtual geomagnetic pole

Magnetic measurements have been made on some lavas found at 60ºN and 90ºW. The inclination angle is 37º. If the horizontal direction of magnetism of these lavas is due west, calculate the position of ...
rob's user avatar
  • 39
3 votes
5 answers
1k views

Where are the oldest igneous rocks found?

I'm trying to catch up on my homework for earth science, but I'm having a difficult time searching for an answer to my question.
Kitty's user avatar
  • 31
3 votes
1 answer
217 views

Complete missing outcrop problem

Given A is upper limit of sand stone, B is the lower limit of the planes that are equal in distance and dip. Dip angle is 29 degrees. Complete the outcrop of this map. —————————————————————————- Now I ...
Mather 's user avatar
  • 131
3 votes
1 answer
647 views

Differentiate a rock and mineral

How to differentiate between a rock and a mineral by merely looking at it as a thumb rule?
gateprep's user avatar
3 votes
2 answers
8k views

How do you calculate the elevation at which clouds will form (lifting condensation level)?

I have a parcel of air at 30°C with a dew point temp of 15°C. It goes up and then back down a mountain 4km in height. Assuming the normal and dry adiabatic lapse rates apply, and an ELR=7.5°C/km, ...
yre's user avatar
  • 485
3 votes
1 answer
1k views

How to determine if this fault is normal, sinistral?

Studying for an exam tomorrow and stumped on this question (parts d and e). The region show in Map 2 consists of a series of sedimentary strata that have been tilted and then eroded, producing an ...
Jim W's user avatar
  • 223
3 votes
0 answers
175 views

Optical Thickness of the Atmosphere

Homework question: Show that the absorption optical thickness of the atmosphere at pressure $p$ (i.e., between $p$ and the top of the atmosphere) as a function of the mixing ratio of the ...
PattyWatty27's user avatar
2 votes
2 answers
150 views

Making clouds for science project

This is about a group project for our science class and we've decided to do a physical model on clouds. We could use liquid nitrogen and hot water to demonstrate the formation of the clouds and we ...
Slocraftus's user avatar
2 votes
1 answer
472 views

Relation between Magnitude of Greenhouse Effect and the Concentration of GHGs like $CO_2$

The Average Surface Temperature of the Earth is calculated by the following equation: $$\sigma T_s^4=\frac{(1-A)\Omega}{4}+\Delta E$$ where, $\sigma$= Stefan-Boltzmann Constant $T_s$= Average Surface ...
RSR's user avatar
  • 23
2 votes
1 answer
146 views

When and where is the atmospheric greenhouse effect strongest?

Is the greenhouse effect stronger in the ice covered area or in the equator? Also is it stronger during winter or summer? I am thinking it is stronger in the Ice covered area and during winter because ...
Meliodas's user avatar
2 votes
1 answer
719 views

The apparent path of the sun

An American College Test sample question asks: Based on the shadow directions in these experiments, which of the following best describes the difference between the apparent path of the Sun as seen ...
Andy's user avatar
  • 37
2 votes
1 answer
102 views

Dynamic meteorology - calculating air temperature based off falling air

I'm not sure if this is the correct place to ask this. Basically I have an exercise in dynamic meteorology that is set up like this: 1 kg of dry air is falling with a constant speed of 0.5 cm / s ...
PadaKatel's user avatar
2 votes
1 answer
132 views

Result of deterioration of vegetation

I had this question in my previous exam, it says: Deterioration of vegetation resulted by overgrazing results in...... 1.desert encroachment. 2.change in climate. I had to choose 1 or 2 and I chose ...
Asmaa's user avatar
  • 585
2 votes
0 answers
65 views

Form Lines from Strike and Dip measurements

I am looking to draw form lines on this map based on the strike and dip measurements taken on site. From what I have gathered it is an anticline with a possible second fault to the right hand side. ...
L Morgan's user avatar
1 vote
1 answer
112 views

How do I find the temperature of the air mass, and how do I use a t-skew chart?

So the first problem I'm stuck on is this one: An airmass is moving down a mountain from point A to B. At A the temperature is -10 Celsius and the pressure is 890hPa. At point B the pressure is 1010 ...
Mathomat55's user avatar
1 vote
1 answer
232 views

Easy homework questions about seasons and daytime

The following homework assignment is supposed to be easy, but there seems to be information missing from the questions asked (or at the very least knowledge from OP). At which width circle does the ...
Lieven Keersmaekers's user avatar
1 vote
1 answer
1k views

What equation should I use in this isostasy problem?

I have this problem, and I am not sure where to start. The only Airy equation in my text is $r_1= \frac{h_1 \cdot p_u}{p_s - p_u}$. This doesn't seem to apply, or if it does it isn't obvious. Is ...
spinelcity's user avatar
1 vote
0 answers
162 views

Finding out actual dip and dip direction of refractor

We have two traveltive curves for first arrivals (direct and refracted) from a dipping refractor in the forward and reverse directions along a profile line. my question is: Is there a logical way (non-...
Elisavet Kollia's user avatar
1 vote
0 answers
3k views

How to draw a strike and dip on a geologic map?

I know that Strike and dip refer to the orientation or attitude of a geologic feature. The strike line of a bed, fault, or other planar feature, is a line representing the intersection of that feature ...
Roy Rizk's user avatar
1 vote
0 answers
161 views

Modification of an air mass

If an air mass that exists in North America starts moving south west or south east what kind of modification will affect it and how would you characterize it in it's final state? My answer is that it ...
Meliodas's user avatar