Constructive and Destructive processes. Guinther, period 3.
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When convergent plate boundaries collide, compression is applied to the rocks, causing the land to uplift and form a mountain.
At divergent plate boundaries, earthquakes can occur and pull plates apart from each other, causing the magma to rise up and form a volcano which is a landform that has been shaping our Earth for years.
Glaciers are huge masses of ice that slowly plow over land. Since they are such heavy objects, they create dents and holes in the land in a process called subsidence. This process can create things like valleys and craters.
After a volcano erupts, the lava hardens and this process repeats causing the land to build up and form landforms like plateaus.
As the wind blows, it picks up particles on Earth’s surface, this process is known as erosion. Sand can be picked up and moved across Earth’s surface, forming sand dunes.
Magma has been a key constructive factor for Earth’s surfaces. When magma rises in the middle of a plate and erupts onto the seafloor, it can build up over time and form islands. This is how the Hawaiian islands formed.
Under the island, in the ocean, trenches can form from a plate subducting under another plate at a convergent plate boundary. This has contributed to the way Earth and it’s oceans are shaped today.
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