Lesson 2: Chapter 9 Plate Tectonics

It helped scientists locate enemy submarines only

It led to the discovery of mountain ranges and mid-ocean ridges under the ocean

It was used to measure ocean temperature

It helped scientists find new species of fish

Abyssal plain

Mid-ocean ridge

Oceanic trench

Continental shelf

It is created by the iron-rich liquid outer core.

Its direction is always constant.

It can have normal and reversed polarity.

It has no effect on magnetic minerals in rocks.

Each pair has similar composition, age, and magnetic character.

They are randomly distributed.

They only appear on one side of the ridge.

They are formed by sediment deposition.

Rocks get older.

Rocks get younger.

Rock age remains the same.

Rock age fluctuates randomly.

They helped scientists locate enemy submarines and measure the depth of the ocean floor.

They were used to detect marine life and study ocean currents.

They allowed scientists to collect water samples from deep ocean trenches.

They helped scientists predict volcanic eruptions under the sea.