Triangular area of land formed from sediments at the mouth of a river, so named because it resembles the shape of a Greek letter
Water containing mineral salts
Extensive area of level or gently undulating land, usually at a low altitude
Shock waves in solid rock caused by earthquakes
Steep hill with a flat surface on top and standing alone in a plain
Water that seeps through the soil or rocks under the earth's surface to supply wells and springs
A shallow body of water separated from a larger body of water by either an atoll or a barrier island
Ringlike coral island consisting of a reef surrounding a lagoon
Topographical boundary indicating the beginning of the softer rock of a plateau, usually marked by a series of waterfalls and rapids
Remains or trace of a plant or animal embedded in rock
Grassy, treeless area near the North Pole
Shows the different heights, shapes, and gradients of land forms, such as hills and valleys, by using shading and colors
Process by which minerals are washed down into lower layers of soil
Process by which water evaporates from oceans, lakes, and other bodies of water and then falls back to the earth in the form of rain, snow, or hail
A naturally occurring substance that is solid and inorganic representable by a chemical formula, usually abiogenic, and has an ordered atomic structure
Neolithic tomb consisting of a large, unhewn stone laid across several upright stones - also known as a cromlech
Large forms of sea life that can swim freely
All the plants and animals living on or near the bottom of the ocean
All the external conditions affecting the development of living things
Shows the configuration of the earth's surface by using lines to join all points in the same height above or below sea level
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