plate techtonics

Where do convection currents take place? Is it in the lithosphere or the asthenosphere?

asthenosphere

How far do scientists estimate the plates move in a year?

2.5 cm

How many major tectonic plates are on Earth's surface?

7 Major plates, 30 plates all together

What are the layers of Earth from most dense to least dense?

Inner core, outer core, mantle, crust

What scientist proposed the continental drift theory in 1912?

alfred wegener

What are the 2 types of crust found on the Earth's surface?

continental crust and oceanic crust

What causes the movement of the plates?

convection currents in the mantle

At what type of boundary would you observe subduction?

convergent

What type of plate boundary is formed when the plates move away from one another?

divergent

What feature(s) form at transform boundaries?

earthquakes

The layer of the Earth that is made up of the crust and upper mantle is called the . . .

lithosphere

Which layer of Earth includes the crustal plates? Is it the lithosphere or the asthenosphere?

lithosphere

What is caused by the action of hot material rising and cool material sinking?

movement of earths plates

The super continent formed when all the continents were together was called . . .

pangaea

What feature(s) form at divergent boundaries?

ridges, earthquakes

Most volcanoes and earthquakes take place in a belt that surrounds the Pacific Ocean called the . . .

ring of fire

There are 2 main reasons geologists think the continents were once connected. One reason is that some coastlines share similar fossils. What is the other reason?

south america and africa looked like they fit together like a puzzle, sea floor spreading, similar rock layers on continents.

In subduction, what determines which plate will be on top and which will be on bottom?

the density

What type of boundary is the San Andreas fault in California?

transform

What type of plate boundary is formed when the plates grind past each other?

transform

What feature(s) form at convergent boundaries?

trenches, Volcanoes, Earthquakes, Mountains