What is reach the top of (something such as a hill or wave).
200
Outer core
What is a layer made out of iron and nickel
200
unbalanced force
What is two individual forces are of equal magnitude and opposite direction.
200
Main Sequence
What is a series of star types to which most stars belong.
200
trough
What is bottom of a wave length
300
lithosphere
What is the rigid outer part of the earth, consisting of the crust and upper mantle.
300
balanced forces
What is two forces acting in opposite directions on an object, and equal in size.
300
Red Giant
What is a very large star of high luminosity and low surface temperature.
300
wavelength
What is he distance between successive crests of a wave.
400
asthenosphere
What is the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur.
400
inertia
What is a tendency to do nothing or to remain unchanged.
400
Fission
What is the action of dividing or splitting something into two or more parts.