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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