55 terms

Science

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Axis
imaginary line that passes through the Earth's center
Rotation
The spinning of earth on its axis
Rotation causes
Day and night
It is DAY on the side of the earth
Facing the sun
Earths rotation causes
The sun to appear to rise in the east and set in the west
Revolution
movement of Earth around Sun
Year
One complete revolution around the sun
Orbit
Path earth follows as it revolves around the sun and it's an oval path
Tilt of Earth's axis
23.5 degrees
Sunlight hits earths surface
Most directly near equator
Near the poles
Sunlight hits earth indirectly at an angle and is spread out over a large area
Earth has seasons because
its axis is tilted as it revolves around the sun
Solstice and earths axis
Axis leans towards or away. Sun at noon appears to stop moving higher or lower in the sky.
Solstice dates
Summer- June 20/21 winter- dec. 21/22
Equinox and earths axis
Axis doesn't lean towards or near from sun. Daylight and night are of equal length everywhere
Equinox dates
Spring- March 20/21 autumn- sept 22/23
eclipse
When the moons shadow hits the earth or earths shadow hits the moon
solar eclipse
Occurs when the Moon passes directly between the Sun and Earth blocking sunlight from the earth
Solar eclipse moon phase
New moon
lunar eclipse
when Earth is directly between the moon and the sun. Earth prevents sunlight from reaching moon
lunar eclipse moon phase
full moon
Tides
The rise and fall of ocean water that occurs every 6 hours
Force of gravity
Pulls moon and earth toward each other
Tides are caused by
Differences in how much the moons gravity pulls on different parts of the sun
Moons gravity
Stronger on the side of the earth closer to the moon
One complete rotation
A day or 24 hrs
One complete revolution
A year or 365 1/4 days
Leap year
One every four years during February and causes an extra day. 365 days
Gravity
A force that attracts all objects together
Inertia
Tendency of an object to resist change in its motion
Inertia and gravity
Combine to keep earth in movement around the sun and moon in orbit around the earth
The _____ side of the moon faces the earth
Sane
Maria
Dark flat areas on moons surface and the Latin word for seas. Hardened rock from huge lava flows billions of years old
Craters
Large rounded pits on moons surface. Created by meteoroids
Highlands
Mountains. Light colored features on moons surface
Temperatures on the moon
130 C to -180 C
Moon has no
Atmosphere which causes change in temperature
How was the moon made
A planet-sized object collided with earth. Gravity causes the material to combine and form the moon
The moon
Revolves around earth, rotates on its own axis
The changing relative position of the moon, earth, and sun causes
The phases of the moon, eclipses, and tides
The moon rotates once on its axis in the
Same amount it revolves around the earth
Rotation period of moon
27 1/3 days
Revolution period of the moon
27 1/3 days
The moon reflect light from the
Sun. Does not produce own light.
Phases
Different shapes you see as the moon makes a complete revolution around the earth
The phases of the moon you see
Depends on how much of the sunlit side of the moon faces the earth
Principle phases
New, Full, First Quarter, Last Quarter
One complete cycle of lunar phases takes
29 1/2 days
Waxing
When we see more and more of the lighted portion of the moon as seen from earth
Waning
When we see less and less of the lighted portion of the moon as seen from earth
Earthshine
Sunlight reflected off earth lighting up dark portion of the moon during crescent phase
Rays
Bright streaks coming out of larger lunar craters
Moon size compared with earth size
1/4
Moon gravity compared with earths gravity
1/6
Moon mass compared with earth mass
1/81