Arid climate - region that receives 10 to 30 centimeters (4-12 inches) of rain each year., Basin - a dip or depression in the surface of the land or ocean floor., Cliff - steep wall of rock, earth, or ice., Durable - strong and long-lasting., Evaporation - process by which liquid water becomes water vapor., Fossil fuel - coal, oil, or natural gas. Formed from the remains of ancient plants and animals., Glacier - mass of ice that moves slowly over land., Harvest - the gathering and collection of crops, including both plants and animals., Ice cap climate - region where temperatures rarely rise above freezing., Latitude - distance north or south of the Equator, measured in degrees., Marine mammal - an animal that lives most of its life in the ocean but breathes air and gives birth to live young, such as whales and seals., Savanna - type of tropical grassland with scattered trees., Thunderstorm - cloud that produces thunder and lightning, often accompanied by heavy rains., Unprecedented - never before known or experienced., Volcano - an opening in the Earth's crust, through which lava, ash, and gases erupt, and also the cone built by eruptions.,

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