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Which layer of Earth is the thinnest?
Crust
These are factors that stay the same during an experiment.
constants
Which two continents coastlines seem to have once fit together perfectly?
What are Earth’s plates called?
tectonic plates
In an experiment, this variable is measured or observed.
dependent variable
DOUBLE: The movement of Earth’s plates is caused by:
Convection currents in the mantle
Which layer is made of liquid iron and nickel?
outer core
Name the fossil that was found on different continents to support continental drift.
Mesosaurus
What rises to create new crust?
magma
DOUBLE: This layer of Earth is very hot and allows tectonic plates to move slowly.
mantle
Alfred Wegener proposed the theory of:
Continental Drift
Which boundary produces earthquakes when plates slide past each other?
transform
DOUBLE: Mid-ocean ridges are under water ___________.
mountains
Name Earth's 4 layers in order from outermost layer.
Crust
Mantle
Outer core
Inner core
This type of plate boundary happens when two plates move away from each other.
divergent
This supercontinent once included all of Earth’s landmasses.
Pangaea
What forms when magma rises at mid-ocean ridges?
new crust
Hot material rises and cool material sinks in mantle creating __________ _______________.
convection currents
DOUBLE: What is subduction?
When plates collide at an convergent boundary and the more dense plate sinks under the other.
This process creates new oceanic crust at mid-ocean ridges.
seafloor spreading
New crust is created at__________________.
Mid-ocean ridge
DOUBLE: Evidence for seafloor spreading includes age of rocks and________ _________.
magnetic striping
The upper mantle and crust make up the ___________________.
lithosphere
Name 3 pieces of evidence that supports continental drift?
In an experiment, this variable is the one that is changed on purpose.
independent