Astronomy Semester Review Part 3

For many years most people mistakenly thought that the Earth was

• very old.

• spherical in shape.

• the only planet in the universe.

• flat.

It is now common knowledge that the Earth is round, spins on its axis and

• contains a lot of rock & minerals.

• has more than one moon.

• sometimes has ice ages.

• revolves around the Sun.

Earth's steady rotation causes day & night, and also the

• seasons.

• equinoxes.

• illusion that the Sun, Moon & stars go around the Earth.

• solstices.

One complete ____ around the Sun takes about 365 days or one year.

• rotation

• trip

• revolution

• spin

Earth is the ____ of the inner planets (Mercury, Venus & Mars).

• largest

• coldest

• smallest

• hottest

The spinning core of the Earth is believed to be a cause of the seasons.

• True

• False

Earth's magnetic field acts as a barrier against harmful solar radiation.

• True

• False

The location of Earth's magnetic poles have slowly changed over time.

• True

• False

Earth travels in a(n) ___ around the Sun - which brings it closer & farther away during a year.

• perfect circle

• helical

• circle

• ellipse

Earth's axis is also tilted 23.5 degrees from its orbit. This tilt causes the ____

• Earth to wobble.

• ice ages.

• Earth to precess on its axis.

• seasons.