Seventh grade Inside Earth Section 1.4 Science quiz

What technology did scientists use to map the mid-ocean ridge?

Sonar
What happens at the mid-ocean ridge?

Sea-floor spreading
What did drilling samples tell scientists?

That the farther the rock was away from the mid-ocean ridge, the older it was.
What did the submersible see when it observed the mid-ocean ridge?

Volcanic rock shaped like toothpaste from out of a tube, or pillows
What is subduction?

When rock is pulled into a trench and into Earth's asthenosphere where it then melts and becomes part of the asthenosphere.
What is sea-floor spreading?

When magma from earth's asthenosphere comes out from a mid-atlantic ridge and adds to the sea floor
what happens at a deep-ocean trench?

Subduction
Why is older crust denser than new crust?

it is cooler
What is the longest chain of mountains in the world?

Mid-atlantic ridge
What are the three types or evidence for sea-floor spreading?

molten material, magnetic striped, and drilling samples

Author

veiwsonic2

182588

Card Set

Seventh grade Inside Earth Section 1.4 Science quiz

Description

made 11-8012, quiz 11-9-12

Updated

2012-11-09T02:12:35Z