1. What are the 3 spheres of Earth?
   

A_________________________________________

B_________________________________________

C_________________________________________

1. Which of the 3 spheres of Earth contains the most mass? __________________________________________
   
2. Complete the chart:
   

Type of Force Definition Examples

Constructive Force

Destructive Force

1. Define atmosphere.
   

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1. What gasses, and what percentages, make up Earth atmosphere?
   

A______________________________________

B______________________________________

C______________________________________

1. Define gravity.
   

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1. What two factors affect gravity?
   

A__________________________________________

B__________________________________________

1. What two things keep the Earth and moon in their orbits?
   

A__________________________________________

B__________________________________________

1. Define revolution.
   

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1. How long is Earth’s revolution? ________________________
   
2. Define rotation.
   

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1. How long is Earth’s rotation? ___________________________
   
2. What location(s) on Earth receive the least sunlight due to the tilt of the axis? _________________________________
   
3. What causes day and night? _________________________________________________________________________
   
4. Describe the moon’s surface.
   

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1. What side of the moon is visible from Earth? ______________________________________________
   
2. Why do we on Earth never see the far side of the moon?
   

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1. What are the phases of the moon? Draw the phases in this blank space below.
   

A______________________________________

B______________________________________

C______________________________________

D______________________________________

E______________________________________

f. ______________________________________

g. ______________________________________

h. ______________________________________

1. During which phases of the moon does a lunar eclipse occur? __________________________________________
   
2. What is the shortest amount of time that could occur between a lunar eclipse and a solar eclipse? ________________
   
3. What affects Earth’s tides? __________________________________________________________________________
   
4. What occur between Earth, moon, and sun that causes Earth’s tides to be the highest?
   

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1. How does a neap tide occur?
   

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1. How long does it take the moon to progress through all its phases? _________________________________________
   
2. Go back to #18, on the arrows, write the time it takes to go from phase to phase.
   
3. Explain what happens during a lunar eclipse.
   

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1. Explain what happens during a solar eclipse.
   

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