Miss O Science Vocab Unit D

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4th grade science vocab, unit D, Patterns on Earth and In Space

air mass

a huge body of air which all has similar temperature and moisture

air pressure

particles of air pressing down on the Earth's surface

anemometer

an instrument used to measure wind speed

asteroid

a small rocky object that moves around the sun

atmosphere

the layer of air that surrounds our planet

axis

an imaginary line which runs through both poles of a planet

barometer

an instrument that measures air pressure

comet

a small mass of dust and ice that orbits the sun in a long, oval shaped path

condensation

the process by which water vapor changes from a gas to a liquid

constellation

the pattern formed by a group of stars in the sky

deep ocean current

an ocean current formed when cold water flows underneath warm water

evaporation

the process in which a liquid changes to a gas

front

the border where two air masses meet

gas giants

the planets, Jupiter, Saturn, Uranus, and Neptune, which are large spheres made up mostly of gases

greenhouse effect

the warming of Earth caused by the atmosphere trapping thermal energy from the sun

humidity

the amount of water vapor in the air

inner planets

the planets closest to the sun: Mercury, Venus, Earth and Mars

orbit

the path that an object such as a planet makes as it revolves around a second object

outer planets

the planets farthest from the sun; Jupiter, Saturn, Uranus, Neptune, and Pluto

planet

a large object that moves around a star

precipitation

water that falls to Earth as rain, snow, sleet or hail

solar system

a group of objects in space that move around a central star

space probe

a space vehicle that carries cameras, instruments, and other research tools

star

a huge, burning sphere of gases; for example, the sun

storm surge

a very large wave caused by high winds over a large area of ocean

stratosphere

the layer of atmosphere that contains ozone and is located above the troposphere

surface current

an ocean current formed when steady winds blow over the surface of the ocean

telescope

a device people use to observe distant objects with their eyes

tide

the daily changes in the local water level of the ocean

troposphere

the layer of atmosphere closest to Earth

water cycle

the constant recycling of water on Earth

wave

the up and down movement of water

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