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which of the following is a sign of a chemical reaction?

a. a liquid changes to a solid.

b. a solid changes to a gas.

c. a gas is released from a liquid.

d. a liquid changes to a gas.

Which other elements contain the same number of outer electrons as sodium

Rocks, as they are compressed, begin forming mountains above the earth's surface when two continental plates converge. the continental crust increases in depth as the mountains grow above. the himalayan mountains formed at a convergent plate boundary in this manner. the rocks are smashed together causing them to due to the intense heat and pressure from the colliding plates and eventually forming rock. a) melt; igneous b) layer; sedimentary c) recrystallize; metamorphic d) melt into the earth's interior; metamorphic

The fact that the total amount of energy in a system remains constant is a(n)