How Earth Was Made - Part 1a

Which topic will NOT be covered in this video?

• How land formed on Earth

• How dinosaurs went extinct

• How water came to be on Earth

• How Earth formed from dust in the solar system

• How life came to be on Earth

There are a number of things that make it hard for the scientists to determine how and when the Earth formed.  Which item on the list below does NOT make it hard for the scientists? 

• Humans destroying rock layers by constructing buildings

• Erosion of the Earth's surface over time

• Volcanic Activity occurring around the Earth

• Tectonic Plates moving over time

What are the oldest rocks that are found on Earth?

• Igneous Rocks

• Sedimentary Rocks

• Metamorphic Rocks

• Meteorites

What created the large crater in Arizona?

• A meteorite crashing into the Earth

• An asteroid crashing into the Earth

• A large dinosaur falling down and making a dent in the Earth

Scientists noticed that tiny grains of salt in space stuck together.  WHY is this observation important when trying to understand how the Earth formed?

How did meteorites form?

• From salt in space sticking together

• From tiny sediments in space sticking together

• They broke off of colliding planets

How big does a clump of particles in space need to be before it has its own gravitational pull? 

• 1 /2 mile wide

• 1 mile wide

• 10 miles wide

• 100 miles wide

How long did it take for Earth to become the size that it is?

• Approximately 3 million years

• Approximately 30 million years

• Approximately 300 million years

• Approximately 3 billion years

What are the 3 main layers of the Earth?

• Igneous, sedimentary, and metamorphic

• Convergent, divergent, and transform

• Crust, mantle, and core

Originally the earth was a bunch of rocks, but what then happened to those rocks?

• They melted

• The compacted and cemented together

• They were moved by the plates shifting