Answer:
Mid ocean ridge are where new crustal material is forced to the surface. The new crustal material is pushed apart forming two different plates moving in two different directions. An ocean trench is where old crustal material is pushed under another plate where it is melted and turned into magma.
Answer:Climate change.
The ongoing trade war between the United States and China.
Rapidly depleting reserves of freshwater around the world.
The looming food crisis.
Economic insecurity in the United States
Explanation:
Sand sheets and dunes cover approximately 25 percent of the Sahara's surface.
Nuclear fission takes place at the core of the sun
