# Glencoe Earth Science

## Chapter 23: The Sun-Earth-Moon System

### Section 1 Self-Check Quiz-Eng.

 1 What is the definition of a sphere? Need a Hint? A) having one or more angles of 90° B) an oval or oblong figure C) a figure bounded by three lines and containing three angles D) Its surface is the same distance from its center at all points. 2 What is Earth's axis? Need a Hint? A) Earth's axis is the imaginary line around which Earth spins. B) Earth's axis is the imaginary horizontal line that separates the northern and southern hemispheres. C) Earth's axis is the imaginary vertical line that separates the eastern and western hemispheres. D) Earth's axis is the imaginary line around which Earth spins around the Sun. 3 What does Earth's rotation cause? Need a Hint? A) a year B) the seasons C) day and night D) eclipses 4 What do scientists believe is the cause of Earth's magnetic field? Need a Hint? A) They believe the movement of material inside Earth's core along with Earth's rotation generates a magnetic field. B) They believe the Earth's revolution around the Sun generates a magnetic field. C) They believe Earth's tilted axis along with Earth's rotation generates a magnetic field. D) They believe the movement of material inside Earth's core generates a magnetic field. 5 What's the difference between Earth's magnetic north pole and Earth's rotational north pole? Need a Hint? A) The magnetic axis is inclined at an angle of 11.5° to the rotational axis. B) The rotational axis is inclined at an angle of 11.5° to the magnetic axis. C) There is no difference; they are lined up along the same axis. D) The magnetic axis is inclined at an angle of 90° to the rotational axis. 6 What is the difference between Earth's rotation and revolution? Need a Hint? A) Revolution refers to Earth's spinning on its axis, and rotation refers to Earth's spinning around the Sun. B) Rotation refers to Earth's spinning on its equator, and revolution refers to Earth's spinning around the solar system. C) Revolution refers to Earth's spinning on its axis, and rotation refers to Earth's changing seasons. D) Rotation refers to Earth's spinning on its axis, and revolution refers to Earth's spinning around the Sun. 7 What causes the distance between Earth and the Sun to change during Earth's yearlong orbit? Need a Hint? A) Earth's orbit is a circle, so the distance sometimes changes. B) Earth's orbit is a circle, so the distance never changes. C) Earth's orbit is an ellipse - an elongated, closed curve - so the distance sometimes changes. D) Earth's orbit is an ellipse - an elongated, closed curve - but the change in distance from the Sun is only an optical illusion. 8 Why doesn't Earth's orbit cause seasonal temperature changes on Earth? Need a Hint? A) Even though Earth's orbit is an ellipse, the change in distance from the Sun is only an optical illusion. B) The change in distance occurs at the same time as the seasons, so we don't notice the change. C) The change in distance is actually minimal. Earth's tilted axis is the real cause of seasons on Earth. D) The change in distance is the real cause of seasons on Earth. 9 When the northern hemisphere experiences summer, it's __________. Need a Hint? A) tilted away from the Sun B) lined exactly perpendicular to the Sun C) tilted toward the Sun D) closer to the Sun 10 The solstice is __________. Need a Hint? A) the point at which the Sun reaches its greatest distance east or west of the prime meridian B) the seasons C) the point at which the Sun is closest to Earth D) the point at which the Sun reaches its greatest distance north or south of the equator 11 An equinox occurs when _______ is directly above _______ equator. Need a Hint? A) Earth, the Sun's B) the Moon, Earth's C) Earth, the Moon's D) the Sun, Earth's 12 In the southern hemisphere, why do equinoxes occur in the reverse of the northern hemisphere? Need a Hint? A) During an equinox, the northern hemisphere is tilted closer to the Sun. B) During an equinox, the southern hemisphere is tilted closer to the Sun. C) During an equinox, the seasons switch, and instead of occurring at the same time, they occur opposite each other. D) During the rest of the days of the year, Earth is tilted, and each hemisphere experiences opposite seasons.