7th Grade Science: Unit 07 Flashcards

Front

Fill in the blank: ________ is the theory that earth’s continents were once one large supercontinent that broke and moved apart over geologic time to form today’s continents.

Back

continental drift theory

Front

Fill in the blank: ________ are plate boundaries where plates are colliding.

Back

convergent boundaries

Front

Fill in the blank: ________ are plate boundaries where the plates are moving apart.

Back

divergent boundaries

Front

Fill in the blank: ________ are widely distributed organisms that lived during only one short period of time.

Back

index fossils

Front

Fill in the blank: ________ is the theory that earth's surface is broken into large pieces called plates that are constantly moving and changing at a very slow rate.

Back

plate tectonics

Front

The law of ________ states that each rock layer is older than the one above it.

Back

superposition

Front

Fill in the blank: ________ are plate boundaries where the plates are moving past each other in different directions.

Back

transform boundaries

Front

A ________ is a large, rigid section of earth’s lithosphere that primarily consists of continental crust and moves slowly over the asthenosphere.

Back

continental plate

Front

Fill in the blank: ________ is the transfer of thermal energy through currents in liquids and gases.

Back

convection

Front

Fill in the blank: ________ means having a high mass per unit volume; in geology, denser materials sink below less dense materials in earth’s layers or during plate interactions.

Back

dense