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51 votes

How did forests end up covering pyramids?

I am an archaeologist and I specialize in the ancient Maya. Here's how it happens: 1: The vast majority of ancient Maya buildings are built using a "core and veneer" technique. The bulk of the ...
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37 votes

Why do trees break at the same wind speed?

Why do trees break at the same wind speed? Image source: Wikimedia Commons Note that in the above image, that almost all of the trees had their tops snapped off. This claim is about tree's being ...
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16 votes
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How did forests end up covering pyramids?

The accumulation of soil in such situations takes a long time. The main way soil would have been naturally transported there would be by the wind. The wind blown soil would get caught and accumulate. ...
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13 votes
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Is the temperature (even a bit) warmer in a forest?

It will depend on the time of year and the time of day. As you noted, you often see more frost in an open field than in a forest. A comment indicated the forest insulated the surface but I believe it ...
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11 votes
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Do forests affect local rainfall and climate significantly?

For rain to fall, water vapour must exist in sufficient quantities in the atmosphere. The main source of atmospheric water vapour is evaporation from oceans. However, evaporation from large bodies of ...
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10 votes
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Where does the water from rain in rain forests come from?

Leaves, mostly. Photosynthesis requires carbon dioxide, and it gets it via stomata - small controllable pores in the leaf. When the stomata open, water goes out, because the air is generally drier ...
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9 votes

Is the temperature (even a bit) warmer in a forest?

Don't forget the protection from wind in colder seasons as well. Basic survival skill is to always make shelters under cover (as in a forest) rather than in an open meadow. On a cold day it may not ...
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  • 425
9 votes

Why do trees break at the same wind speed?

As the other answer points out, this is very likely an evolutionary adaptation that balances sturdiness with unnecessary overengineering. From a physics perspective, the relatively constant breaking ...
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8 votes

How will increased $\ce{CO2}$ affect forests and other vegetative areas?

If you increase CO2 concentration and keep all other parameters at there current level, then biomass production should go up. The reason is simply that CO2 is one of the building blocks biomass is ...
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  • 529
8 votes
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Why is it said that Amazon creates 20% of the oxygen production of the world, when it accounts with less than 14-12.8% of the forest area?

I cannot find any language in peer-reviewed literature (as far as publicly accessible) that makes the 20% claim reported in the question. I therefore consider this claim to be of obscure and dubious ...
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  • 408
8 votes

Why do trees break at the same wind speed?

The general claim seems to be incorrect: This phenomenon is independent of type and size of the tree. Based on other answers, the claims around this appear to be that the scale of the tree doesn't ...
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7 votes

What is the difference between a carbon sink and a carbon reservoir?

The difference is that a carbon sink accumulates carbon, whereas a carbon reservoir has accumulated carbon. That is to say: A carbon sink is an ongoing process which is increasing the amount of ...
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7 votes
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How will increased $\ce{CO2}$ affect forests and other vegetative areas?

One of the consequences that I find more fascinating with the increased CO2 problem is the changes that affect specific components of the environment. One example that I like is the effect on poison ...
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7 votes
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How do optical satellites detect different leaf types?

Short answer Different plants reflect light at different wavelengths with specific patterns. If you know the reflection pattern of a broad-leaved forest and that of a needle-leaved forest, you can ...
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6 votes
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What is the name for the forested areas in mountains below the treeline?

Forests directly below the alpine tree line are high-elevation or Montane forests. See more about Montane ecology here. Image from http://www.nature.com/scitable/knowledge/library/global-treeline-...
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6 votes
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With humans out of the equation, what could cause forest fire?

Wildfires are mainly caused by humans (or their technology) and lightning. Lightning is the most prolific natural source. There really aren't many other sources in most areas, unless there is ...
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6 votes

Historical data on world's forest area

When I need data about past and future projected land use change, I usually refer to the global dataset that was developed for the global climate simulations CMIP6. The dataset is the Land Use ...
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5 votes

Why is ground water rising on these forest rings?

Nobody knows - yet. But one can say that these rings are too numerous and too regular in shape to be related to either kimberlites or (even more bizarrely) Oklo-type natural nuclear reactors, as some ...
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5 votes

How do optical satellites detect different leaf types?

In general, no, NDVI is not used to derive vegetation type. NDVI is useful for studying phenology, but it won't tell you the type of plant that is being remotely sensed. Good land cover systems use ...
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5 votes

How will increased $\ce{CO2}$ affect forests and other vegetative areas?

CO2 can only enhance plant growth when other resources such as nutrients or water are not limiting growth. If N for instance is scarce, no matter how much you increase CO2, plants will not take ...
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5 votes

Regarding forest fire season and using robotic devices for proactive efforts before any fires

This is counterproductive, both ecologically and economically, and is also well beyond the capabilities of current robots. Ecologically counterproductive Forests have evolved to live with, and in ...
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5 votes

Why is it said that Amazon creates 20% of the oxygen production of the world, when it accounts with less than 14-12.8% of the forest area?

Do we need to worry about oxygen? No. Although some reports have claimed the Amazon produces 20% of the world’s oxygen, it is not clear where this figure originated. The true figure is likely to be ...
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5 votes

Trees: What does "highly tapering stem" mean?

A "highly tapering stem" is simply that the trunk of the tree is less cylindrical and more conical in profile. It's a problem because while you may have a lot of timber volume you don't have as much ...
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  • 494
5 votes

Do trees capture more CO2 during a fast growth stage?

Right, there are a lot of misconceptions about this. They are mostly to do with the difference between the magnitude of carbon storage and the rate of carbon uptake, and also the difference between ...
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  • 494
5 votes

Why do trees break at the same wind speed?

Some excellent answers are already available, but they are all examining a single tree in isolation, as if putting a tree to a wind tunnel to see whether it snaps or not. That's not how every trees ...
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5 votes

Looking for study on the pollution of the forest

So far, I thought there won't be any studies on the overall scenario of waste disposals. After searching in depth, I have found studies on illegal waste dumping sites in Polish forests. Hope these ...
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4 votes
Accepted

Mud bricks with shale

Your idea has merit. Shale is classified by geologists as being a mudstone. It is composed of silt and clay sized minerals. According to this geology website, shales can be crushed to produce a clay ...
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4 votes

How will increased $\ce{CO2}$ affect forests and other vegetative areas?

It seems that tropical forests absorb more carbon dioxide than many scientists have believed before. NASA and NCAR scientists have shown that tropical forests absorb 1.4 billion metric tons out of a ...
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4 votes
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Wildfire acreage, two dimenional or three?

The same issue arises when land is bought and sold. The area used is the flat area from a plan. Slope is not considered because it would require at lot of data because the rate of change of topography ...
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4 votes

What is the difference between a carbon sink and a carbon reservoir?

A carbon reservoir is measured by the amount of carbon it contains, for example kilograms of carbon [kg C]. A carbon source or sink is measured by the amount that comes out or into the reservoir from ...
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