Astronomy Today Chapter 7

The most abundant gas in Earth's atmosphere is oxygen.

False

The ozone layer blocks much of the Sun's visible radiation.

False

When plates collide, they fuse together and come to rest.

False

In the past, most of the landmass on Earth was concentrated in a single, large continent.

True

The Greenhouse Effect works by trapping outgoing infrared radiation from the Earth.

True

The continuing rise in the carbon dioxide in our atmosphere should cause our surface temperatures to rise.

True

The oldest rocks on the Earth's crust are radioactively dated at about four billion years old.

True

The ozone layer lies in the region between the troposphere and the mesosphere.

True

The region around Earth where the magnetic field traps charged particles is the Van Allen Radiation Belts.

True

The three most abundant gases in our atmosphere are nitrogen, oxygen, and argon.

True