Vocabulary words from unit E.

Term Definition
air The mixture of gaseous substances that make up Earth’s atmosphere, which is primarily nitrogen and oxygen.
altitude The elevation level above the sea.
atmosphere The layer of gases that surround a planet or moon.
climate The typical / usual weather for an area, usually determined over a span of thirty years or more.
clouds Visible groups of water droplets formed in the atmosphere. Fog forms nearer to the Earth’s surface.
condensation The process of change from a gaseous state to a liquid state that is usually accomplished when the air warms up and cools down again
energy Many different forms that cause motion. It is measured in joules.
evaporation The process of change from a liquid state to a gaseous state that is usually accomplished when the air cools down and warms up again.
exosphere The outermost region of a planet’s atmosphere.
freezing A point during which a liquid solidifies; freezing point is thirty-two degrees Fahrenheit.
front (cold, warm) A boundary where two masses of air of different temperature meet.
Gulf Stream A strong ocean currents that flows from the Gulf of Mexico to northwestern Europe along the Atlantic Ocean.
humidity The amount of water vapor in the atmosphere.
hypothesis A possible explanation of a phenomena or occurrence that can be proved or disproved by observations and / or testing.
landform A physical feature found on the Earth’s surface.
latitude The angular distance from of a location to the earth’s equator. Lines of latitude run from east to west.
melting A point during which a solid liquefies.
mesosphere The region of the earth's atmosphere above the stratosphere and below the thermosphere.
meterologist An expert in or student of meteorology, or the study of the atmosphere.
ocean current A continuous, directed movement of seawater or ocean water.
precipitation The movement of water from the Earth’s atmosphere to the surface of the planet.
pressure (high, low) A physical force exerted on or against an object. It is measured in either pounds per square inch (psi) or 100 newtons per square meter (millibars).
prevailing wind The most common wind direction for an area, affected by the latitude of the area.
stratosphere The layer of the Earth that is above the troposphere and above the mesosphere.
thermosphere The layer of the Earth’s atmosphere in which the temperature steadily rises as altitude increases. This region is located above the mesosphere.
troposphere The lowest layer of the Earth’s atmosphere, starting from the planet’s surface and extending up to 20km above sea level. Almost all weather occurs within the troposphere.
water cycle The movement of water from one state to another as it circulates throughout different parts of the earth.
water vapor Water’s gaseous state.
weather The current state of the atmosphere at a specific place or area.
wind The perceptible movement of air from areas of lower pressure to areas of lower pressure.

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