4.1 and 4.2

Question 1

A substance made up of atoms of two or more different elements joined by chemical bonds.

Answer 1

Compound

Question 2

A wave of energy that travels through the Earth and away from an earthquake in all directions.

Answer 2

Seismic Waves

Question 3

An instrument that records vibrations in the ground and determines the location and strength of an earthquake.

Answer 3

Seismographs

Question 4

The hypothesis that states that the continents once formed a single landmass, broke up and drifted to their present locations.

Answer 4

Continental Drift

Question 5

One landmass made of all the landmasses we know today.

Answer 5

Pangaea

Question 6

Places where sea-floor spreading takes place.

Answer 6

Mid-ocean Ridges

Question 7

When Earth’s magnetic poles change places.

Answer 7

Magnetic Reversals

Question 8

Part of molten rock at mid-ocean ridges.

Answer 8

Magnetic Minerals

Question 9

Process that takes place at mid-ocean ridges.

Answer 9

Sea-Floor Spreading

Question 10

Items that provide evidence that the continents were once closer together.

Answer 10

Fossils