Hướng dẫn và trắc nghiệm nghe toefl itp thuộc 20 câu sau - Mã 97104750

To explain the answer to an examination question.

To review what students know about volcanic activity.

To demonstrate the use of a new measurement device.

To provide background for the next reading assignment.

They occur at regular intervals.

They can record the Earth’s internal temperature.

They can withstand great heat.

They travel through the Earth’s interior.

When the Earth was formed.

The composition of the Earth’s interior.

How often a volcano is likely to erupt

Why lava is hot.

What did P and S waves help scientists discover about the layers of the earth?

How deep they are.

How hot they are.

What purpose they serve.

Where earthquakes form.

Hướng dẫn và trắc nghiệm nghe toefl itp thuộc 20 câu sau – Mã 97104750