The spinning of the Earth on it's axis is called a _______________. p. 23
One revolution of the Earth around the Sun takes approximately _______________. p.24
We have different seasons because of ___________________. p. 25
Look at figure 3 on p. 25. Which month is the sun shining most directly on the northern hemisphere?
The length of the day is the same everywhere in the world. p. 26
When the Northern Hemisphere is at its strongest tilt towards the sun, it is called _____________. p. 26
The force that attracts all objects toward each other is called ______________. p. 27
Newton's law of univeral gravitation states that the strength of gravity between two objects depends on which 2 factors? p. 27
An object's mass can change depending on what planet it is on. p. 27
If you weighed 120 pounds on Earth, how much would you weigh on the moon? p. 27
If the sun is constantly pulling on the Earth then why doesn't the Earth crash into the sun? p. 28
Which of these is not an example of inertia? p. 28
What is Newton's first law of motion? p. 28
Planet's orbits are held in place by what two forces? p. 29