Consider the southeast coast of north america and the northwest coast of africa. according to the current theory of plate tectonics, these two regions were once very close together. however, the coasts do not quite fit together like puzzle pieces, as one might expect. this can be explained by the fact that the southeast edge of north america' actually does fit nicely with the northwest edge of africa' even if the coasts do not.

meteorologists would compare a new weather map with one 24 h old to see how fast a front is moving.

which

what is a measurement of the earth’s history divided into time periods?

> fossil record <

sedimentary rock

> geologic time scale <

radioactive elements

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.