The pacific plate collides with and is subducted under four other crustal plates. the area where this happens has lots of volcanic activity. this area is called the
ring of volcanoes
ring of fire
bermuda triangle
ring of heat

The protons in a nucleus are approximately 2 ✕ 10^−15 m apart. consider the case where the protons are a distance d = 1.93 ✕ 10^−15 m apart. calculate the magnitude of the electric force (in n) between two protons at this distance.

Examine the drawing of a molecule. each ring represents an atom of nitrogen (n). what’s the chemical formula of this substance?

Substances that assume the shape of their container, but do not have a definite size are called