Meteorites
Earthquakes
Volcanoes
Earth's Layers
Earth's History
100
A space rock that hits the Earth.
Meteorite
100
Term used for earthquakes that are caused by the crust being pushed up a lot.
"Megathrust"
100
Term used for the line of volcanoes that are located around the edges of the Pacific ocean.
"Ring of Fire"
100
The Earth melted because of these extremely hot elements.
Radioactive Elements
100
"Megathrust" earthquakes under the ocean cause these.
Tsunamis
200
The Earth first formed from these that also make up meteorites.
Tiny Mineral Grains
200
The place on the Earth's surface directly above where the plates start slipping to start an earthquake.
Epicenter
200
"Blocky" lava is evidence of this.
Viscous Magma
200
The Earth's core is made up of these two metals because they are very dense and sunk to the middle.
Iron and Nickel
200
The Moon is thought to have originated from a chunk of the Earth because Moon rocks lack this element.
Iron
300
The water on the Earth came from tiny droplets of water inside these.
Salt Crystals
300
Evidence of what causes "megathrust" earthquakes includes this kind of a pattern of epicenters.
A Dipping Pattern
300
The reason why viscous lava causes explosive volcanoes.
Trapped Gasses and High Pressure
300
Term used for molten rock the Earth's mantle.
Magma
300
Stromatolites contain fossils of these microorganisms that are thought to have added the first oxygen to the atmosphere.
Cyanobacteria
400
The age of the Earth was determined because meteorites were radiometrically dated to be this old.
4.567 Billion Years Old
400
The land was thrust upward by 25 feet during this earthquake.
Alaska 1964
400
This is what causes plumes of super hot magma.
Water
400
Tectonic plates move because they float on magma which has these.
Convection Currents
400
The banded iron found in amphibolites is evidence that these had already formed by 4.3 million years ago.
Oceans
500
Life on Earth may have started because meteorites were carrying these.
Amino Acids
500
Leaning rocks from past wave action are evidence that this was once one of these.
Shoreline
500
This is how water gets deep under volcanoes.
Subduction of the Ocean Floor
500
The fact that space is extremely cold is what formed this layer of the Earth.
Crust
500
Evidence that the water under volcanoes came from the ocean comes from the fact that this mineral is found in lava rock.
Hornblende
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