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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, ...

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15 views

Agricultural self sufficiency after yellowstone eruption?

Given a 440 acre farm running roughly 200 acres of Crops and 40-50 head of cattle,in the secondary ash zone within the lake of the ozarks reigon of Missouri, how viable would survival be relying on ...
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0answers
22 views

Why does the hardness of Cu & Al vary?

I know the a mineral's hardness is determined by its bond strength and crystal lattice.I know that both Cu and Al have FCC structure but how do we predict its difference in harndness with close ...
5
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2answers
125 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 ...
3
votes
1answer
84 views

Differentiate a rock and mineral

How to differentiate between a rock and a mineral by merely looking at it as a thumb rule?
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0answers
19 views

what are some limitations for using meteorites as evidence for the Earth's age?

I'm currently doing a question at the moment which is: Evaluate the usefulness and limitations of evidence provided by meteorites of Earth's age. I'm having trouble finding some limitations at the ...
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0answers
33 views

How does one analyze this graph on atmospheric C02 data obtained from the Mauna Loa observatory?

Graph I am analyzing: What I am trying to figure out from the graph is: What is the range for CO2 over the record (approximation) What are the major forcings for the overall trend in this record ...
5
votes
1answer
98 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 ...
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1answer
74 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 ...
4
votes
1answer
159 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, ...
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1answer
116 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 ...
8
votes
4answers
121 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 ...
2
votes
2answers
86 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 ...
3
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0answers
80 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 ...
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0answers
40 views

Pyrite oxidation

How much pyrite has to be oxidized to produce a sulfate concentration of 15 mM? If the solution initially has a pH of 8, roughly what would the pH drop to if there is no buffering of acidity?
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votes
1answer
52 views

The sun rises up at 7:30 in 25°E, What time will the sun rise up in 15°E?

I've a question about time calculating. The sun rises up at 7:30 in 25°E, What time will the sun rise up in 15°E? What I've tried $$25° - 15° = 10°$$ By the way $$10° . 4 = 40 \space \text {...
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0answers
63 views

Potential temperature

Hi I'm really stuck at a problem and my formulas don't work. So here is the questions. Question 1 a) An atmosphere is isothermal from 1050 mb to 800 mb, with Temprature = 5 degree °C. After the ...
3
votes
4answers
226 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.
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2answers
248 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 - ...
3
votes
1answer
58 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 ...
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0answers
39 views

How can the hydrosphere be properly used to reduce the load on the lithosphere [closed]

The earth is made up of 70% hydrosphere and 30% lithosphere.The space of lithosphere is continually used and it seems there is a threat to a balance ecosystem.Describe how the hydrosphere can be make ...
5
votes
1answer
123 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 ...
7
votes
1answer
132 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 fossiliferous ...
1
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0answers
29 views

Residence time for another planet [closed]

This is a question about residence time for another planet with the following information below: When we arrive on the second habitable planet, we discover that it is also exactly like Earth, except ...
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0answers
36 views

Deriving advective transport equation

How to derive advection transport equation? Is the above derivation correct?
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0answers
15 views

Categories for supervised classification, wildlife analysis

I am using GIS to undertake a small research on the loss of natural habitat in north England. I will be using Supervised Classification where I train the system on a few examples, e.g. shallow water ...
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0answers
22 views

Has there been loss of natural habitat in north England?

Has there been loss of natural habitat in north England or Britain in general over the past years? If there was, what is the loss in percentage? A reference would be highly appreciated
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1answer
87 views

To find hardness in Mohrs scale [closed]

Except diamondת which mineral is having high hardness in Mohr scale. A Oxide B silicate C carbonate D phosphate
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1answer
126 views

Where can i find a shallow-water solver in MATLAB?

I do not know how to solve the shallow water equations in the matrix form in MATLAB. I didn't find anything useful on the internet. I have the specific mathematical equations to solve (please see the ...
1
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1answer
72 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 ...
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0answers
59 views

Do reverse faults tilt the underlying layers of rocks to form an angular unconformity?

I came across this question while studying in my text book: What does the existence of strata containing a reverse fault and above them parallel strata refer to? I thought that referred to an angular ...
2
votes
2answers
122 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 ...
5
votes
1answer
98 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., ...
4
votes
1answer
138 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 ...
0
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0answers
159 views

chronological ordering of sequence for relative dating

Can anyone help me with this? Enter from in chronological order, from oldest to most recent, the letter corresponding to processes A through H below. Use upper case letters and insert one letter per ...
5
votes
1answer
270 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 ...
7
votes
1answer
70 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 ...
4
votes
0answers
62 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 ...
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0answers
66 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, ...
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2answers
2k 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 ...
5
votes
1answer
441 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 ...
3
votes
1answer
276 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)...
3
votes
2answers
1k 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: ...
6
votes
1answer
581 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}\,...
6
votes
1answer
704 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 ...
6
votes
2answers
821 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 ...
6
votes
1answer
235 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 ...
9
votes
1answer
179 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 ...
2
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1answer
311 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 ...
2
votes
0answers
488 views

How to calculate the infiltration rate? [closed]

This is Exercise 4.8.1 in Introduction to Physical Hydrology by Martin Hendriks. The water level above flat terrain during an experiment with double ring infiltrometer is 20 mm. The saturated ...
0
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1answer
453 views

What's the difference between Waste Water Reclamation and Waste Water Reuse? [closed]

I receive a project which there's the follow topic: Waste Water Reclamation and Reuse Are they not the same meaning, reuse and reclamation in this case?