52 terms

7th grade -Science Revolution and Rotation - chapter7

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Rotation
occurs when something is spinning around an axis
What are examples of things that rotate?
Tops, ballerinas, figure skaters, cyclones, tornadoes, a merry-go-round, Earth
How do we know Earth rotates?
Star-trails, circular paths from the planet moving
What curves because of the Earth's rotation?
Winds and ocean currents
How are ocean currents different in the Northern Hemisphere and Southern Hemisphere?
They curve clockwise in the northern hemisphere and counterclockwise in the southern hemisphere
What causes Night and Day?
The rotation of the Earth
daylight
The side facing the Earth has
night
The side facing away from the Earth has
How long does it take for the Earth to complete one ROTATION?
24 hours (a day)
The Earth is titled on what?
Axis 23.5 degrees
Earth's tilt always faces direction of the
North Star
What causes our days to get longer in the summer and shorter in the winter?
Earth's tilt
The sun rises in the __________ and sets in the _______
Rises in the East and sets in the West
This occurs when the Earth moves around the Sun
Revolution
One Revolution is
365 1/4 days or one year
The speed the Earth's revolution is
18 miles per second
What two things cause the difference in the seasons?
Angle of Sun's rays and Length of Days
The two kinds of rays from the Sun are:
Direct (when earth is titled toward the sun) Indirect (when the Earth is titled away from the sun)
In the summer we get what kind of Sun ray?
Direct rays
In the summer the days are?
Longer
In the Winter we get what kind of Sun ray?
Indirect ray
In the Winter the days are
shorter
In the Summer we are __________ away from the sun
farther
In the Winter we are ___________ to the sun
closer
The moon is a:
natural satellite
It is one of more than
96 moons in our Solar System
The only moos of the planet
Earth
The Moon is About 384,000km (240,000 miles) from
Earth
The Moon is about 3,468 km
in diameter
The Moon's surface
has no atmosphere, no liquid water, extreme temperatures
Moonlight is reflected
sunlight
Half the moon's surface is always reflecting
light
From Earth we see different amounts of the Moon's
lit surface
The amount of the moon seen is called
a "phase"
Half of the Moon is always lit by the
sun
As the Moon orbits the Earth, we see different parts of the
lighted area
The revolution of the Moon around the Earth makes the Moon look as if it is
changing shape in the sky
This caused by the different angles from which we see the lighted part of
the Earth's surface. These are called "phases" of the moon
The Moon passes through eight shapes during a cycle that repeats itself every
29.5 days
Phase Order
New moon, waxing crescent, first quarter, waxing gibbous, full moon, waning crescent, third quarter, and waning gibbous
The lighted side of the Moon faces
away from the Earth
Sun, Earth and Moon are almost in a
straight line (with the Moon between the Sun and Earth)
The Moon we see looks
very dark
Waxing Crescent Moon
can be seen after the New Moon but before the First Quarter Moon.
Waxing
means increasing or growing larger
First Quarter Moon
The right half of the moon appears lighted and the left side appears dark.
Waxing Gibbous Moon
This moon can be seen after the First Quarter Moon, but before the Full Moon.
Full Moon
The lighted side of the Moon faces the Earth. The Moon that we see is very bright from the sunlight reflecting off it.
Waning Gibbous Moon
The Moon can be seen after the Full Moon but before the last quarter Moon.
Waning
means decreasing, or growing smaller
Third Quarter Moon
The left half of the Moon appears lighted and the right side of the Moon appears dark.
Waning Crescent Moon
The Moon can be seen after the Last Quarter Moon and before the New Moon.