Plate Tectonics (2018)

all the continents used to be connected in a giant continent but have since drifted apart

• continental drift theory

• magnetic reversals theory

• seafloor spreading theory

the force that causes the movement of Earth’s tectonic plates

• conduction

• convection currents

• radiation

Scientists began to accept the theory of plate tectonics

• after they found a map of the world from 5 billion years ago

• after new evidence was discovered

• after Columbus discovered America

Fossils of the same plants and animals are found on widely separated continents supports the idea that

• the continents were never connected

• the connected have drifted apart

• the continents are joining together

The fact that the continents fit together like a puzzle supports the idea that:

• the continents were never connected

• the connected have drifted apart

• the continents are joining together

The THREE pieces of evidence for continental drift:

• divergent, convergent , & transform boundaries

• conduction, convection currents, & radiation

• seafloor spreading, magnetic reversals, & the fossil record

The continents fit together like a ___.

• puzzle

• catfish

undersea mountain range

• mid-ocean ridge

• divergent boundary

• volcano

At the mid-ocean ridge, rocks closer to the ridge are ___.

• younger

• older

At the mid-ocean ridge, rocks farther from the ridge are ___.

• younger

• older