Earth's Layers
Which layer do we live on?
The crust
Who first proposed the theory of Continental Drift?
Alfred Wegener
Approximately how many plates make up Earth's crust?
20
Convection currents travel in a ________ motion.
Circular motion
Divided into tectonic plates. Rocky portion of the upper mantle.
Lithosphere
What was the name of the supercontinent Alfred Wegener believed to exist approximately 250 million years ago?
Pangea
Which of these does not happen due to plate movement?
Mountains
Volcanoes
Earthquakes
Precipitation
Precipitation
Convection currents is the transfer of _________ by the movement of a heated fluid.
Heat
This layer is composed of liquid iron and nickel.
Outer Core
Alfred Wegener said which two continents look like they once fit together perfectly?
Africa and South America
The force powerful enough to move the tectonic plates is called...
Convection Currents
Colder, more dense fluid rises or sinks?
Sinks
Which layer do Plate Tectonics flow on?
Asthenosphere
What was Alfred Wegener's hypothesis?
All of the modern-day continents had previously been clumped together in a supercontinent he called Pangaea.
What are the three types of plate boundaries?
Divergent, Convergent, and Transform
What causes convection currents in the asthenosphere?
Heat from the core and lower mantle
Made of molten iron and minerals that will flow under pressure.
Mantle
Alfred Wegener used fossils as evidence to prove his theory the continents were once one large continent. Which freshwater reptile fossil did Alfred Wegener study to explain this?
Mesosaurus
Where are active volcanoes and earthquake epicenters primarily found?
Along plate boundaries
What causes convection currents?
Changes to the fluids density and the force of gravity