Question

1. choose the best answer.

what does the chart describe?

• its depth varies from 6 km on the ocean floor to 48 km on land.
• it can reach temperatures of 700°c.
• it is broken into about 20 large pieces, or plates.

1. choose the best answer.

the discovery of mountainous — where new crust is formed supported the theory of plate tectonics.
volcanic islands
mid - ocean ridges
ocean floor sediment
vegetation

Explanation:

For question 3: The description about depth (6 - 48 km), temperature (up to 700°C), and being broken into plates matches the characteristics of the Earth's crust.
For question 4: Mid - ocean ridges are where new crust is formed as magma rises and solidifies, supporting the theory of plate tectonics.

Answer:

1. crust
2. mid - ocean ridges