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

To demonstrate the use of a new measurement device.

To explain the answer to an examination question.

To review what students know about volcanic activity.

To provide background for the next reading assignment.

They travel through the Earth’s interior.

They can record the Earth’s internal temperature.

They occur at regular intervals.

They can withstand great heat.

Why lava is hot.

How often a volcano is likely to erupt

When the Earth was formed.

The composition of the Earth’s interior.

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

What purpose they serve.

How deep they are.

How hot they are.

Where earthquakes form.

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