How Earth Formed

How Earth Formed

Earth formed about 4.5 to 4.6 billion years ago. At first, Earth was molten and lacked an atmosphere and oceans. Gradually, the atmosphere formed, followed by the oceans.

CK-12 (High School)

Essential Question

Common Core Standards

RST.6 - Author's Purpose, RST.2 - Main Ideas

Depth of Knowledge (DOK) Levels

3,2

Assignment

2
questions
notes
Read this assignment in Actively Learn