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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  • 631
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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4 votes

How did forests end up covering pyramids?

Most of the Mexican pyramids are less steep than their Egyptian counterparts, and have niches and terraces which their Egyptian counterparts don't. An important difference is the climate, which is ...
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4 votes
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GIMMS NDVI3g grid cells not entirely square-shaped?

Your understanding is inaccurate. The shifts by $\frac{1^\circ}{24}$ are only relevant for figuring out, where the pixel centers are located and where to start when you are looking to find the right ...
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  • 994
3 votes
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How did these grassy hillsides in Colombia become terraced?

These are terracettes https://en.wikipedia.org/wiki/Terracette#targetText=In%20geomorphology%2C%20a%20terracette%20is,them%20to%20move%20slowly%20downhill These are caused by natural earth movements ...
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  • 183
3 votes

Why does foliage coloration vary on north/south sides of ridge (Northeast USA)?

Your photo doesn't show the strip of autumn-coloured trees very well; without your description I would have taken it for a strip of bare earth. All sorts of things could account for the autumn shades, ...
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3 votes

Does anyone know a book/article/research that talks about forest fire prevention?

This book is based on Australian experience, some of it may be relevant of North American wildfires. I read it ten years ago. Paul Collins, Burn - The Epic Story of Bushfire in Australia, Allen & ...
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3 votes

Natural spiral pattern of grass - what could cause this?

You have two options ice segregation/frost heaving or humans screwing around. Frost heave can produce some really unusual yet regular shapes, spirals included. Frost heave and ice segregation is ...
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  • 6,558
2 votes

Natural spiral pattern of grass - what could cause this?

Given that it's a quarry then at a guess the grass is growing over areas that are cut into the bedrock more deeply than the non-grassed areas, this means that there is a trench that holds a little ...
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  • 4,225
2 votes

How did forests end up covering pyramids?

Disclaimer: this answer is based on what I remember from school and TV. When a volcano erupts with lava flows, the magma cools and forms an inhospitable, sterile surface. The first life to colonise ...
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  • 213
2 votes
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What is the error in bathymetric observations in the presence of vegetation?

As noted in the comments, this is actually a much more complex question than it might seem at first. Answering fully would require a very involved and technical discussion of single-beam surveying's ...
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  • 495
1 vote
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Why autumn follows the rainy season

The precise reasons for leaf shedding after monsoon aren't well known and studied, but there are vague reasons like optimising use of light and warmth for max photosynthetic gain. So the tree has a ...
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1 vote

How did forests end up covering pyramids?

The Accumulation of organic detritus begins when a structure is abandoned or poorly maintained. Plants that thrive without soil (epiphytes, lithophytes) are often the first generation of plants. As ...
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1 vote
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How to get single value of NDVI value from four different directions?

After given some information about the data source I have a simple answer. Since the underscores SW etc. represent the four pixels around the city center and all the pixels cover the same physical ...
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