Our Changing Earth

What are the movements that act in the interior of the earth called?

What are the forces that work on the surface of the earth known as?

Sudden movements like earthquakes and volcanoes are caused by which type of forces?

What is the molten magma inside the earth called when it pours out on the earth's surface?

What is the vent or opening of a volcano called?

What is the place in the crust where the earthquake movement starts called?

Which point on the surface is directly above the focus of an earthquake?

Name the instrument used to measure earthquakes.

The magnitude of an earthquake is measured on which scale?

What is the wearing away of the landscape by different agents like water, wind, and ice called?