landform - a surface feature of earth Ex. Mountain, destructive process - process that wears down the surface of the Earth, weathering - the breaking down of rock at or near the Earth's surface, sediment - loose particles of weathered rock including sand and pebbles, erosion - when weathered rock is picked up and moved, glacier - huge sheets of ice that move slowly across land, model - something used to represent an object or process, observation - information gathered with the senses, gravity - force that pulls all objects toward earth, earthquake - A shaking of the ground that happens when rock below Earth’s surface breaks and moves suddenly, volcano - An opening in the earth’s surface that lets hot, melted rock and gases escape,

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