# Tag Info

### In the northern hemisphere only, what percentage of the surface is land?

I get 40.4% With a workflow using a tiny bit of Python. After Polygorial‘s comment I am adding (Updated on Feb 17, 2021) point zero to state more explicitly that this method requires a map like the ...
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Accepted

### Are "monoliths" giant, isolated rocks sitting in dirt, or are they continuous with bedrock

the trick is not all isolated rocks are produced the same ways. Of the two in your pictures the first is an old volcanic events; intrusions, dikes, ect. depending on which rock in the region you are ...
• 6,878
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### What is the name of this landform?

This is a large glacier calving event. Calving occur at the front of the glacier, probably a very wet (and likely warm based) glacier where a considerable amount of water is flowing out of the system (...
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### Is there a hemisphere where there's more land than ocean?

I wrote a little Matlab script to estimate this approximatively. Here is the result: colour denotes the total land area inside the hemisphere centred on a particular surface point. The red point is ...
Accepted

### Is it possible that a reduction in vegetation is a cause of global warming?

The short answer is that people do talk about it. It is commonly referred to as "land use change". In general, the carbon dioxide equivalent of the effects of land-use change is on the order of 10% ...
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### Why does the road appear wet on a sunny day?

This optical illusion is due to refraction of visible light due to density gradients near the surface and the fact that the index of refraction in a medium is dependent on the density of the medium. ...
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### Half of Earth with most landmass

You would have to cut somewhere along this circle: The only landmass here is New Zealand, eastern Australia, eastern PNG, western North America and some Pacific islands. I'm pretty sure you can tweak ...
• 23.1k
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### Is there a hemisphere where there's more land than ocean?

The total land area of earth is approximately 29%. So, in order to have a hemisphere with more land than water, out of 29% of total land area we need to have at least 25% of it concentrated in that ...
Accepted

### Is an underground mine collapse or a tunnel collapse called a sinkhole?

This is probably more of an English language question than a science question. The answer to it depends on the extent of a person's vocabulary & knowledge of a particular field of engineering. ...
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### How to identify a landslide area early?

Curved trees are a sure sign of movement of surface. Special geomorphic shapes are also present in a slowly developing landslide. At the top of the landslide cracks can start to show, at the foot you ...
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### What's the minimum number of days needed for reporting a "monthly average" of daily satellite retrievals?

Provide a monthly average in every grid cell, and describe how many measurements were used for each cell. There is no fixed rule for the minimum number of days for reporting a monthly average. A ...
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### (Why) Is there more landmass on Earth's Northern hemisphere than the Southern Hemisphere?

In the attached JPL graphic from Heflin et al, 2007.9- every data point located south of the equator shows a northward component of motion (except the Nazca plate west of South America and a small ...

### The geology of local landscapes and small scale features

(this is consciously the start of the answer - my regional geology books -cf. above comment, are packed away due to a house move). The rolling hills are very distinctive of the English Jurassic & ...
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### In the northern hemisphere only, what percentage of the surface is land?

The Northern Hemisphere is 40% land and 60% water. The Southern Hemisphere is 20% land and 80% water.

### When does an island with isthmus become a peninsula?

In a topological sense, if it's connected by an isthmus then it isn't an island. That doesn't mean that it might not be called that - but the answer is a cultural & political one, and hence won't ...
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### When does an island with isthmus become a peninsula?

I think the naming difference is largely qualitative and even arbitrary in some cases. There are lots of 'islands' that are technically connected to a larger landmass by an isthmus of some sort, which ...
• 1,817
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### Half of Earth with most landmass

It's a moot point, and probably varies somewhat according to the state of the tide. Visually, however, the 'pole of maximum ocean' is about half-way between two atolls in the south Pacific: Tautua, 9&...
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### How to identify a landslide area early?

I'm not sure if this is the scope you're looking for but a large portion of site analysis using GIS is to examine potential risks of natural disasters. Mass wasting risk maps based on topographical ...

### How to identify a landslide area early?

Terrestrial laser scanning (the ground-based version of Lidar) provides very precise mapping of surfaces. This has been used to look for changes in cliff faces and slopes that are precusors to failure....
• 4,429
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### How or where to find out how many percent of the Earth's surface is above/below a certain altitude?

What you want is known as a hypsograph or a hypsographic/hypsometric curve which shows the distribution of elevations of the Earth's land surfaces (and can be extended to include the distribution of ...
• 813
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### Can we define "drainage density" for a soil column (point-scale)?

Fundamentally it doesn't make sense to describe the point scale model with hillslope length and drainage density. If you are looking to model a soil column, you could use Darcy's law or Richard's ...
• 751
1 vote

### How to calculate the specific humidity based on the saturated specific humidity?

Just in case it will save a great deal of time for others in the future, ill recommend the metpy package. https://unidata.github.io/MetPy/latest/api/generated/metpy.calc....
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1 vote

### How to calculate the specific humidity based on the saturated specific humidity?

The answer is easy. Replace $T$ with $T_d$, where $T_d$ is the dewpoint temperature. I will say I am not all that familiar with those equations, but that is besides the point.
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### What is the name of this landform?

The terrain in the photo is a glacier. There have been a number of incidents since early in World War 2 where aircraft have crashed into or attempted to land on glaciers in the Andes or Greenland, ...
• 4,695
1 vote

### High resolution global land use projections

While this isn't 10km or less, the CMIP6 dataset is released as of last week. It's now at 0.25degree spatial resolution which is an improvement.
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### How to identify a landslide area early?

In developed areas perhaps the most telling evidence of a developing landslide in its early stages are doors and windows that no longer open and close easily and cracks in pavements and curbs that ...

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