Learning from the History About Plate Tectonics on Earth,scientists Now

question 9

Multiple Choice

Learning from the history about plate tectonics on Earth,scientists now predict that

• A)continents will continue moving apart for a few hundred million years more.
• B)continents may come back together during the next few hundred million years,forming new mountain ranges and larger continents.
• C)continents will soon slow in their drift and stabilize.
• D)continents will speed up in their drift across the planet,potentially causing a sixth major extinction event.

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Definitions:

Death Rate

A measure of the number of deaths in a particular population, scaled to the size of that population, per unit of time.

Per Capita Growth Rate

A measure of the rate of growth per person in a population, often used in demographic or economic studies.

Birth Rate

The measure of population growth in a given area, calculated as the number of live births per thousand people per year.

Death Rate

The ratio of deaths to the population of a particular area within a certain period of time, usually expressed per 1000 individuals per year.