How Earth Was Made - Part 2

How old were the amphibolites (those strange looking rocks in Canada)?

• 4.5 billion years old

• 4.3 billion years old

• 43 billion years old

How do scientists know that 4.3 billion years ago that the Earth's crust must have been at least 12 miles thick?

Why do banded iron formations that are approximately 4.3 billion years old prove that the Earth was covered in water 4.3 billion years ago?

How much of the Earth is covered in land?

• 0%

• 30%

• 70%

• 100%

The clue that shows us where the water on Earth came from was found where?

• In amphibolites

• In a cave

• The moon

• In a meteorite

What is the circle in the video that is moving around?

• Salt

• Iron

• Water

• Amphibolite

How were the oceans formed on Earth AND how long did it take to form the oceans?

What chemicals were found in the meteorites?

• Amino Acids

• Stomach Acids

• Lactic Acids

• Citric Acids

Before finding the meteorites, where did scientists believe amino acids came from?

• The oceans

• Outer Space

• Chemical Reactions on Earth

• Amazon

Why were scientists so focused on trying to find out where amino acids came from? (why are amino acids so important?)