7 Ways We Know What's Inside the Earth

T or F? Scientists have drilled down through the crust and reached the mantle. 

• True

• False

Seismic waves travel at different speeds through rocks with different ____________.

• colors

• categorizations 

   

• densities

Scientists can use ____________________ to do things like see how rocks can conduct electricity to determine the structure under the crust. 

• electromagnetic anomalies

• magic

• nuclear explosions

Mapping gravitational fields can help scientists determine how ___________ the materials under the crust are. 

• dense

• red

• layered

Using radioactive dating with _____________  and samples from the earth's crust, geologists can figure out how old some of our rocks are. 

• french fries under your car seat

• satellites

• meteorites

In your own words, why is it so hard for scientists to study the inside (or the layers) of the Earth?

What is one thing that was interesting to you that was mentioned in the video?