What happened around 800 million years after Earth formed to allow rocks to form?A.Life began to appear.B.The ozone layer formed.C.Earth cooled sufficiently.D.The sun dimmed considerably
Question
What happened around 800 million years after Earth formed to allow rocks to form?A.Life began to appear.B.The ozone layer formed.C.Earth cooled sufficiently.D.The sun dimmed considerably
Solution
C. Earth cooled sufficiently.
Here's a step-by-step explanation:
- The Earth formed around 4.54 billion years ago.
- For the first 800 million years, the Earth was too hot and volatile for rocks to form. This period is known as the Hadean Eon.
- As the Earth's crust began to cool, it solidified to form a thin crust. This process is known as differentiation, where denser materials sank to the core while lighter materials rose to the crust.
- This cooling process allowed for the formation of the first rocks on Earth's surface. These rocks were likely basaltic in composition, similar to the volcanic rocks found on the ocean floor today.
- Therefore, the answer is C. Earth cooled sufficiently.
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