CBA 4 - Study Guide Solar System & Changes in Earth Over Time

Comets are mostly made of ____.

• ice.

• rock.

• metal.

• gas.

The orbital path of most planets is an ellipse but looks almost ____.

• circular.

• triangular.

• rectangular.

• square.

The four inner planets (Mercury, Venus, Earth, and Mars) are ____.

• rocky (terrestrial) planets.

• gas giants.

• ice giants.

• dwarf planets.

Earth vs. Mars – Earth has an abundance of liquid water, while Mars does not. True or False?

• True

• False

All planets have about the same shape but differ in mass, diameter, and composition. True or False?

• True

• False

A rocky, rotating object located far from the Sun and 250 km wide is likely an ____.

• asteroid.

• comet.

• planet.

• moon.

Scale model of Jupiter (14 cm) – Best choice for Earth is ____.

• 1.2 cm.

• 2.5 cm.

• 3.0 cm.

• 0.8 cm.

Meteors are small rocky objects that burn brightly when entering Earth’s ____.

• atmosphere.

• ocean.

• crust.

• core.

Galileo Galilei discovered the Galilean moons orbiting ____.

• Jupiter.

• Mars.

• Venus.

• Saturn.

Neptune takes 165 years to complete an orbit, the longest of any planet. True or False?

• True

• False