Earth Science

Question 1

What are the two theories that make up plate tectonics?

Answer 1

1. Continental drift

2. Sea-floor spreading

Question 2

What is continental drift?

Answer 2

The continental movement of the continents over time.

Question 3

The name of the supercontinent?

Answer 3

Pangea

Question 4

What are moving areas called?

Answer 4

Tectonic plates

Question 5

How did convection currents cause sea-floor spreading?

Answer 5

Rising hot magma pushes up, theit is then pushed to one side by more rising magma, the ridge splits and moves apart. Tension between surrounding rocks cause rift zones & shallow earthquakes.

Question 6

What causes the Earth’s magnetic field?

Answer 6

The outer core gives the Earth its north & south poles and magnetic field.

Question 7

Which is thicker continental or oceanic crust?

Answer 7

The crust is thickest under the continents and thinnest under the oceans.

Question 8

What is the Mid-Atlantic ridge and what is happening there?

Answer 8

The Mid-Atlantic Ridge is a continuous mountain range in the middle of the Atlantic Ocean. Sea floor spreading is occurring there.