8th science ch. 4 lesson 1

The belief that continents have not always been fixed in their present positions was first suggested as early as _________.

• 1596

• 1956

• 1745

• 1873

the geographer who made two maps showing his version of how the American and African continents may have once fit together, then later separated.

• Antonio Snider-Pellegrini

• Alfred Wegener

• ;askdj

• aldskf

the meteorologist that introduced the continental drift theory

• Antonio Snider-Pellegrini

• Alfred Wegner

• ;askdj

• aldskf

the scientific theory and idea of moving continents

• continental drift theory

• continental shift theory

• rock shifting theory

• earth movement theory

What year was the continental drift theory introduced?

• 1910

• 1596

• 1952

• 1877

What did Alfred Wegener base his continental drift theory on?

• the coasts of the continents fit like a puzzle

• the continents had matching geologic features

• identical fossils of plants and animals found on separate continents

• the difference in climate from past to present

Many scientists agree with Wegener's continental drift theory.

• true

• false, rejected it

Why did many scientists reject Wegener's hypothesis that the continents moved apart?

(continental drift theory)

• it didn't explain HOW the continents moved and broke up

• they didn't support that the coasts of the continents could fit like a puzzle

• it didn't prove the fossils were actually the same on each continent

Advances in oceanography allowed for mapping of the ocean floor which provided evidence

that earth's surface ....

• was composed of moving plates

• was one solid piece of rock

Mid-ocean ridges are long chains of undersea ________.

• mountains

• volcanoes

• waves

• currents