The main agents that cause metamorphic rocks to form are
A. weathering and erosion.
B. heat and pressure.
C. melting and cooling.
D. deposition and compaction.

B. Heat and Pressure

Explanation:

This is because the rocks were once igneous or sedimentary which underwent change through physical and chemical processes...

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because the two particles have an equal charge, the charges will cancel out and give the atom an overall charge of 0. so, if at atom has 35 protons in the nucleus, we could expect it to have 35 electrons orbiting that nucleus.