Chapter 7: The Earth-Moon-Sun System

Solstice

________: occurs when Earths rotation axis is tilted directly toward the Sun or away from the Sun.

Ecliptic

________: defined as the plane of Earths orbit around the Sun.

Ellipse

________: an elongated, closed curve with two foci.

Earth

________ is the only planet whose characteristics make it possible for life as we know it to survive.

Clementine

________ compiled a detailed map of the Moons surface, including the South Pole- Aitken Basin.

Maria

________: the dark- colored, relatively flat regions on the Moons surface.

Equinox

________: Earths axis is perpendicular to a line drawn from the center of Earth to the center of the Sun.

Tide

________: rise and fall in sea level.

Regolith

________: the accumulation of debris on the Moon.

Earths Axis

________ is tilted 23.5° from a line perpendicular to the plane of its orbit.

Number of Hours of Daylight

The tilt also causes the ________ to vary.

Eclipses

________ can occur only when the Sun, the Moon, and Earth are lined up perfectly.

Gravity

________: the attractive force between two objects that depends on the masses of the objects and the distance between them.

Mid-Summer

During ________ in the northern hemisphere, the Sun is higher in the sky throughout most of the day compared to other times of the year.

Partial Lunar Eclipse

A(n) ________ occurs when only a portion of the Moon moves into Earths umbra.

Lunar Eclipse

A(n) ________ begins when the Moon moves into Earths penumbra.

Solar Eclipse

________: occurs when the Moon moves directly between the Sun and Earth and casts a shadow on part of Earth.

Sphere

a round, three-dimensional object, the surface of which is the same distance from the center in all directions

Time Zone

an area 15° wide in which the time is the same