Snow avalanches can be compared to landslides. Loose-powder avalanches move like a flow and slab avalanches move like a slide.
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What is Avalanches?</h3>
Avalanches can start spontaneously, as a result of causes like increasing precipitation or decreasing snowpack, or by outside forces like people, animals, and earthquakes. Large avalanches can catch and move ice, rocks, and trees. They are mostly made of rushing snow and air.
The two main types of avalanches are slab avalanches, which are built of tightly packed snow and are caused by the collapse of a weak snow layer beneath them, and loose snow avalanches, which are made of looser snow. Avalanches typically accelerate quickly after being triggered and increase in bulk and volume as more snow is gathered. A powder snow avalanche could emerge if an avalanche moves quickly enough to mix part of the snow with the air.
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D. rift valleys.
Trenches occur at convergent oceanic plates; fossils are extremely old bones, bodies, or footprints, which have gotten so old the intervening years have turned them into rock; U-shaped valleys are valleys which are shaped like the letter U, and are usually formed by glaciers, which tend not to occur underwater very often.
This is primarily because the sun heats the earth's surface unevenly. As heat is trans- ferred to the air, we get regions of warm and cool air which can turn into regions of low and high pressure. This difference in pres- sure makes a force that causes the wind to blow.
So I would say the rising of warm air and the falling of cool air.
