1.
Imaginary line divides Earth's Northern and Southern Hemispheres
2.
When Earth's rotation axis is tilted neither towards or away from the Sun.
3.
An attractive force that exists between all objects that have mass.
4.
the amount of energy that passes through a square meter of space in one second.
5.
The path an object follows as it moves around another object.
6.
The orbit of one object around another object.
7.
The spin of an object around its axis.
8.
The line around which an object rotates.
9.
When the Earth's rotation axis is tilted directly towards or away from the Sun.
