Chapter 23 Vocaulary Flashcards

Front 1

Axis

Back 1

Imaginary vertical line that cuts through the center of Earth and around which Earth spins

Front 2

Ellipse

Back 2

Occurs when Earth or the Moon temporarily blocks the sunlight from reaching the other

Front 3

Equinox

Back 3

Twice-yearly time, each spring and fall, when the Sun is directly over the equator and the number of daylight and nighttime hours are equal worldwide

Front 4

Full Moon

Back 4

Phase tha occures when all of the Moon's surface facing Earth reflects light.

Front 5

Impact Basin

Back 5

A hollow left of the surface of the moon caused by an objectstriking its surface

Front 6

Lunar Eclipse

Back 6

Occurs when Earth's shadow falls on the Moon

Front 7

Maria

Back 7

Dark- colored, relatively flat regions of the Moon formed when ancient laca reached the surface and filled craters on the Moon's surface

Front 8

Moon Phase

Back 8

Change in appearance of the Moon as viewed from the Earth, due to the relative positions of the Moon, Earth, and Sun

Front 9

New Moon

Back 9

Moon phase that occurs when the Moon is between Earth and the Sun, at which point the Moon cannot be seen because it lighted half is facing the Sun and its dark side faces Earth.

Front 10

Revolution

Back 10

Earth's year long elliptical orbit around the Sun

Front 11

Rotation

Back 11

Spinning of Earth on its imaginary axis, which takes about 24 hours to complete and causes a day and night to occur

Front 12

Solar Eclipse

Back 12

Occurs when the Moon passes directly between the Sun and Earth and casts a shadow over part of Earth

Front 13

Solstice

Back 13

Twice-Yearly point at which the Sun reaches its greatest distance north or south of the equator

Front 14

Sphere

Back 14

A round, three-dimensional object whose surface is the same distance from its center at all points; Earth is a sphere that bulges somewhat at the equator and is slightly flattened at the poles

Front 15

Waning

Back 15

Describes phases that occurs after a full moon, as the visible lighted side of the Moon grows smaller

Front 16

Waxing

Back 16

Describes phases following a new moon, as more of the Moon's lighted side becomes visible