1.3

Question 1

what are convectional currents

Answer 1

heat-driven cycles that occur in the air, ocean, and mantle

Question 2

where do convectional currents occur

Answer 2

air, ocean, mantle

Question 3

how did they help prove continental drift theory

Answer 3

1. coast line fit
2. fossil fit
3. geologic fit
4. evidence of past glaciers
5. evidence of past climates

Question 4

what is the plate tectonic theory

Answer 4

• the earths outer crust is made up of dozens of individual plates
• convection currents in the mantle are what the plates move around
• this movement of plates is what forms mountains, volcanos, earthquakes, deep ocean trenches, and more