How can we help?
You can also find more resources in our
Select a category
Something is confusing
Something is broken
I have a suggestion
What is your email?
What is 1 + 3?
Ch 19 Part 2
It makes a high tide higher and a low tide lower.
Makes a high tide lower and a low tide higher.
A device to observe distant objects in space.
The dark flat areas on the moon.
Chunks of rock or dust from space.
A device that expels gas in one direction to move the other.
The velocity that is required to get into orbit.
The velocity required to escape the gravity of a planet.
An object that revolves around another thing in space.
A spacecraft that can be resused after going into space.
A large artifical satelite which people can live and work for a long period of time.
Is a space craft that carries scientific instrements and can collect data.
A robot that can move around on a surface.
The daily rise and fall of Earth's waters.
The reaction force that propels a rocket forward.