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Cross word!

Across
??? is the outermost layer of our planet and is less than 1% of the entire Earth's size.
??? is molten rock that has been extruded onto Earth's surface
??? can become a lot bigger if it will freeze.
??? are formed by sediment that is deposited over time, usually as layers at the bottom of lakes and oceans.
A volcano that can explode in any moment
The continents of the world seem to fit together like puzzle pieces!
A ??? is a mountain that opens downward to a pool of molten rock below the surface of the earth. When pressure builds up, eruptions occur.
A volcano that will never explode
??? are produced by all earthquakes.
??? is a layer of undisturbed rock usually located beneath a surface layer of soil or other material.
??? takes place when rocks are broken down without any change in the chemical nature of the rocks. The rocks are essentially torn apart by physical force, rather than by chemical breakdown.
??? is home to Canada, the United States, Mexico and Greenland.
??? is a type of limestone that forms when limestone is subjected to a lot of pressure over a long period of time.
??? are the slowest of the three waves.
??? are the simplest and most common type of volcano. They can develop as free-standing volcanoes, but can also grow around new vents on the slopes of existing shield volcanoes or stratovolcanoes.
??? is the second layer of the Earth.
??? form when existing rocks are exposed to heat and pressure deep within the Earth's surface.
??? are a side to side movements.
??? rain can also be produced from volcanic eruptions, burning coal and even rotting plant life.
??? involve the powerful movement of rocks in the Earth’s crust. The rapid release of energy creates seismic waves that travel through the earth.
Down
??? is an igneous rock that forms when molten rock cools very rapidly.
??? takes place in almost all types of rocks. Smaller rocks are more susceptible, however, because they have a greater amount of surface area
??? is a molten and liquid rock that is only found below the earth’s surface.
??? one of the most coveted gems on earth, are a different form of carbon. They are formed under intense pressure and heat over billions of years.
Animals and plants can wear away rocks. This is called ???
??? is an igneous rock with grains large enough to be seen with the naked eye.
A volcano tha can became an active.
A ??? is usually built up from highly fluid magma flows, which results in a volcano with a low profile that is spread over a large area, similar to the shield of a warrior if it were lying on the ground.
The mojor ???: The Eurasia, The North America...
Rocks are made of different types of ???
??? is the second to last layer of the Earth.
??? are sessile marine invertebrates that belong to the phylum Cnidaria.
A small piece of ??? you have in your hand today could amount to billions of ??? at the end of the year.
is a metamorphic rock that forms from mudstone or shale.
Most people buy ??? strictly for investment purposes, or to have for protection against an economy such as ours incase our dollar collapses.