Valley - a low area between mountains where a stream or glacier flows. , Volcano - an opening in earth's crust where lava cinders ash, and gasses come to the surface., Mountain - a natural elevation of the earth's surface rising more or less abruptly to a summit., Plain - a low area of earth's surface that is often formed by flat lying sediments., Canyon - a "v" shaped narrow steep sided area eroded by a stream., Delta - a fan shaped deposit of earth materials at the mouth of a stream., Island - land completely surrounded by water and not large enough to be called a continent., Cave - a hollow in the earth, especially one opening more or less horizontally into a hill, mountain, etc., Cliff - a high steep face of a rock., Hill - a natural elevation of earth’s surface smaller than a mountain., Isthmus - a narrow strip of land, bordered on both sides by water, connecting two larger bodies of land., Peninsula - an area of land almost completely surrounded by water, except for an isthmus connecting it with the main land., Elevation - the distance above sea level of a spot on Earth's surface., Plate - a large section of Earth's crust that is able to move., Magma - melted rock from inside Earth's crust., Lava - magma, or melted rock that reaches Earth's surface., Barrier - something that blocks movement.,

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