Mod G Unit 2 Test Review

How does atmospheric pressures relate to surface temperatures on these planets?

• least temperature variation for planet(s) with higher pressures

• most temperature variation for planet(s) with higher pressure

• no temperature variation for planet(s) with lower pressures

• least temperature variation for planet(s) with lower pressures

Which of the following statements best describes the characteristics of the terrestrial planets?

• rocky cores; close to sun; surface craters

• small, dense, rocky surfaces

• made up of hydrogen and helium; small; close to the sun

• large, planetry rings: many moons

What roll did gravity play in forming the sun?

• Gravity caused the solar nebular to collapse toward the center, causing the center of the sun to to be dense and hot.

• Gravity turned the protoplanetary disk into a rotating solar nebula, which became the sun.

• Gravity caused the small particles to collide to form larger particles called planetesimals, which eventually formed the sun.

• Gravity turned the protoplanetary disk into a planetesimal, which became the sun.

What property of the gas giant planets would account for their having more moons than the number of moons that orbit Earth?

• Gas giants are more massive than Earth and thus have greater gravitational forces, so they could attract more objects.

• Gas giants rotate more rapidly than Earth, so they eject more material that could form natural satellites.

• Gas giants are less dense than Earth, so they contain less material that could form natural satellites.

• Gas giants are farther from the sun than Earth, so there are fewer objects in that part of space to attract into orbits.

A comets ion tail always faces

• away from the Earth

• away from the sun

• towards the sun

• the opposite of the direction it is moving

What describes an effect of centripetal force?

• objects move in an elliptical path

• objects move in a circular path

• objects break apart in space

• objects move in a straight line

When looking at certain stars, astronomers observe no parallax. This parallax problem can be explained with different models. Which statement supports a geocentric model of the parallax problem?

• The stars are too far away for a visible parallax.

• Earth is not moving, so no parallax exists.

• The stars are too close for a bisible parallax.

• Observation points differ, so there is no visible parallax.

Johannes Kepler mathematically determined the motion of planets in our solar system. He stated those results in his laws of planetary motion. According to these laws, how do planets move in the solar system?

• elliptical orbits around the sun

• circular orbits around Earth

• elliptical orbits around Earth

• circular orbits around the sun

Galileo used a telescope to see objects in the universe that had not been previously seen. The drawing below shows what he might have concluded from his observations of Jupiter. What did Galileo's observations show?

• all celestial bodies orbited the sun

• planets had elliptical orbits

• planets other than Earth had bodies moving around them

• all celestial bodies orbited Earth

Dark areas can form in the photosphere of the sun. These areas are cooler than surrounding areas. They also have a strong magnetic field. Which term best describes these dark areas?

• Sunspots

• a solar flare

• solar wind

• a prominence