What is the outermost layer of the Earth called?

Which gas is most abundant in Earth’s atmosphere?

What causes earthquakes?

Which layer of the Earth is made of molten metal?

What type of rock is formed from cooled lava?

Which scale is used to measure the magnitude of earthquakes?

What is the name of the supercontinent that existed millions of years ago?

What do we call molten rock inside the Earth?

The Earth's core is mostly made of which metal?

What do we call the study of earthquakes?