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Geologists determine absolute age by comparing the amounts of radioactive and nonradioactive elements in
v rock. The radioactive, or
M. elements decay into nonradioactive elements. Because this
rate of decay is
for each element, geologists can compare the amounts of stable and unstable elements
to determine how much of the
y elements have formed over time.
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answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.