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Plate Tectonics

6th grade Plate Tectonics

Holes drilled several kilometers into Earth's crust provide direct evidence about Earth's interior in the form of what? rock samples
Geologists obtain indirect evidence about Earth's interior by what? recording and studying seismic waves
What is the correct order (starting from the surface) of Earth's layers? crust, mantle, outer core, inner core
Earth's inner core is _______? a dense ball of solid metal
Heat transfer within a fluid takes place by what? convection currents
According to Wegener's hypothesis of continental drift, _____________________. the continents were once joined together in a single landmass
What is Pangaea? The name of the supercontinent that existed millions of years ago
Which type of evidence was NOT used Alfred Wegener to support his continental drift hypothesis? evidence from human remains
Why did most geologists reject Alfred Wegener's idea of continental drift? Wegener could not identify a force that could move the continents
In sea-floor spreading, molten material rises from the mantle and erupts where? along mid-ocean ridges
How did scientists discover that rocks farther away from the mid-ocean ridge were older than those near it? by determining the age of rock samples obtained by drilling on the sea floor
What did scientists notice when they observed the mid-ocean ridge? pillow-shaped rocks formed by the rapid hardening of molten material
The process in which the ocean floor sinks beneath a deep-ocean trench and back into the mantle is known as what? subduction
Most geologists think that the movement of Earth's plates is caused by what? convection currents in the mantle
The geological theory of ________________ states that pieces of Earth's lithosphere are in constant, slow motion. plate tectonics
What is a place where two plates slip past each other, moving in opposite directions? transform boundary
Where does a rift valley form? divergent plate boundary
Using data from seismic waves, geologists have learned that Earth's interior is made up of several what? layers
Earth's magnetic field is a result movements in the ____________. outer core
Scientists think that convection currents flow in Earth's _________________. mantle
A collision between two pieces of continental crust at a converging boundary produces a _________________. mountain range
The place where two plates come together is known as a ___________________. convergent boundary
What forms when continental plates pull apart at a divergent boundary on land? rift valley
What part of the mantle is made of soft rock that bends like plastic? asthenosphere
In the mantle, heat is transferred as soft rock flows slowly in circles is known as what? convection currents
What process continually adds new crust to the ocean floor along both sides of the mid-ocean ridge? sea floor spreading
Subduction occurs where the oceanic crust bends down toward the mantle at a _____________. deep ocean trench
The lithosphere is broken into sections called _______________ that float on top of the atmosphere. plates
What is the process in which the ocean floor sinks beneath a deep-ocean trench and back into the mantle? subduction
What is made of liquid iron and nickel and moves to produce Earth's magnetic field? outer core
Created by: Pacelli



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