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Border- an imaginary line that divides one place from another Geography- the study of Earth and all the different things on it Landform- a shape that makes up the Earth’s surface Plain- large area of nearly flat land Valley- low patches Ridge- a narrow chain of land between hills of mountains Plateau- a high, flat area of land that rises steeply above the surrounding land River System- made up of all the streams and rivers that flow into one larger river Bay- part of an ocean that reaches into the land Tributary- a smaller river or stream that flows into a larger river Elevation- the Weather- the height of land above the level of sea condition of the air at a certain time in a certain place, including temperature, precipitation, and wind Climate- + the pattern of weather of a certain place over many years + Temperaturea measurement of how hot or cold something is Precipitationthe moisture that falls to the ground in the form of rain, snow, sleet, or hail Hurricane- a storm with very strong winds and heavy rains Tornado- a swirling funnel of wind that moves over the ground at high speeds Environmentthe surroundings in which people, plants, or animals live Natural Resource- something in the environment that people can use Renewable Resource- + resources we can replace Nonrenewable Resourceresources that are limited Fuel- a substance burned as a source of heat and power, such as coal, wood, or oil Mineral- a natural substance that is found in the ground and does not come from plants or animals Economy- the way a state produces and uses natural resources, goods, and services Pollution- the result of carelessly using resources, such as chemicals, that make air, water, or soil dirty Conservationthe careful use of a natural resource Recycle- to use something again instead of discarding it Scarcity- not having enough resources to satisfy people’s needs or wants