Corteza continental

The Earth's crust forms the continents and seabed, sitting atop the denser mantle layer. Composed mainly of granite, it varies in thickness from 10 to 70 km. The crust is slowly created and destroyed through geological processes, with the oldest rocks dating back 4 billion years.

What does the Earth's crust primarily form?

• The oceans

• The atmosphere

• The core

• The continents and seabed

What lies beneath the Earth's crust?

• The core

• The mantle

• The atmosphere

• The ocean

What is the main component of the Earth's crust?

• Basalt

• Limestone

• Granite

• Sandstone

How thick can the Earth's crust be?

• Between 70 and 100 km

• Between 10 and 70 km

• Between 1 and 10 km

• Over 100 km

Approximately how old are the oldest rocks found in the Earth's crust?

• 4 billion years

• 3 billion years

• 2 billion years

• 1 billion years