1
2
3
4
5
100
One stays the same and one changes
What is the difference between the geographic N pole and the magnetic N pole?
100
Convection currents and uneven heating of the earth air
How does air move?
100
River slows down and drops sediments
How does a delta form?
100
365 days
How long does it take the earth to revolve around the sun?
100
Moon's gravitational pull
What causes tides?
200
Magnetic Field
What causes a compass needle to always point north?
200
Crust, mantle, outer core and inner core
What are the layers of the earth?
200
Earth's tilt
What causes the seasons?
200
Solar energy does
What source of energy is needed to keep the water cycle going?
200
Aurora Borealis
What occurs in the magnetic field?
300
24 hours
How long it take the earth to rotate once on it's axis or a day?
300
Subsoil
What soil contains the most organic matter?
300
Trees and fossil fuels burned.
What can cause a decrease in O2 in Earth's atmosphere?
300
Crust
What is the thinnest layer of the earth?
300
Hurricanes, volcanoes, tornadoes and earthquakes
What are some destructive forces on Earth?
400
Plate tectonics
What causes earthquakes and volcanoes?
400
Stars, galaxies, planets, astroid belt and comets
What is in the solar system?
400
More direct sunlight at the equator.
Why are days cooler at the poles and hot at the equator?
400
Moon
What is the earth's natural satellite?
400
Condensation of water
How are clouds formed?
500
Precipitation and the water cycle
How is water returned to the earth?
500
Shields and absorbs the UV rays
What is the function of the ozone layer?
500
Increase
What elevation change causes a decrease in O2 in the atmosphere?
500
Sun Earth Moon
How do the sun, earth and moon need to be aligned for a lunar eclipse to occur?
500
The sun reflecting and the position of the earth.
What causes the moon phases?
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