Crystalline, Made of crystals. It describes something that has the regular structure., Erosion, The gradual process by which rock, soil, and sand are broken down and moved away by natural forces like wind, water, and ice., Estimate, To judge the size, amount, or cost of something without calculating it exactly. (As a noun, it's the rough calculation itself.), Fossil, The remains or impression of a prehistoric plant or animal that has been preserved in rock for a very long time., Hum, To make a low, steady continuous sound with your lips closed. It can also describe a low, continuous noise made by a machine., Ice shelf, A large, floating sheet of ice that is attached to a coast and extends out over the ocean. It forms when a glacier flows down to the sea., Invertebrate, An animal that does not have a backbone or spinal column, such as an insect, worm, or jellyfish., Iron, A strong, heavy metal that is very common. It is used to make steel and is also found in the blood of living things., Icy, Covered with or consisting of ice. It also means something is extremely cold., Methane, A colorless, odorless gas that is the main component of natural gas. It is also a very powerful greenhouse gas., Meteorite, A piece of rock or metal from space that survives its passage through the atmosphere and lands on the Earth's surface., Oxygen, A colorless, odorless gas that is essential for most forms of life and is a major part of the air we breathe., Protein, A complex substance found in all living things essential for growth and repair of the body and are made up of amino acids., Rainforest, A dense forest that grows in tropical areas where there is a very high amount of rain all year round., Rectangle, A flat shape with four four straight sides where all four angles are right angles, and opposite sides are equal in length., Remnants, The small parts of something that are left over after the main part has been used, destroyed, or disappeared., Rust, A reddish-brown substance that forms on iron or steel when it is exposed to air and water. It is a form of corrosion., Sauropod, A type of very large, long-necked, plant-eating dinosaur that walked on four legs., Swamp, A wetland area where the ground is permanently saturated with water and usually contains trees and other woody plants., Waterfall, A place where a stream or river flows over the edge of a steep drop or cliff..

Antarctica

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