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This is the innermost layer of the Earth, mostly made of iron and nickel.
Core
This is the outermost layer of the Earth.
This layer is found below the crust and has a semi-molten upper part.
Mantle
This part of the core is molten.
outer core
This part of the core is solid.
Inner core
This part of the mantle consists of deformable rocks.
asthenosphere
These are vibrations that travel through the Earth.
seismic waves
This boundary separates the mantle from the crust.
Moho
This scientist proposed the continental drift theory.
Alfred Wegener
This was the name given to the single landmass that once held all continents together.
Pangaea
The lower part of the mantle is molten because of this factor.
high temperature from the core
In the early 1900s, this scientist discovered that seismic waves move faster beneath the Earth’s surface.
Andrija Mohorovičić
This theory says that continents were once joined in one large landmass.
continental drift theory
This ocean surrounded Pangaea, meaning “all seas.”
Panthalassa
Molten rock flowing up through cracks in the ocean floor provided evidence for this theory.
seafloor spreading theory
This type of crust is found beneath the oceans and is thinner than continental crust.
oceanic crust
This boundary between the crust and mantle is named after Mohorovičić.
Mohorovičić Discontinuity (Moho)
This theory explains the large-scale motion of the Earth’s surface.
plate tectonics theory
This process happens when molten rock hardens and pushes the ocean floor apart.
seafloor spreading
This theory explains how rigid plates float on the mantle and carry continents and ocean floors.
plate tectonics theory
This type of crust forms the land where continents are found.
continental crust
Scientists study the speed of these to learn about the layers inside the Earth.
seismic waves