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MCA Mrs. Hampton Honors

weather

condition of the atmosphere in one place during a short period of time

climate

weather patterns that are typical for an area over a long period of time

revolution

complete trip around the sun

equinox

March 21, the suns rays fall directly on the equator

tropic of cancer

23 1/2 degrees N, northernmost point on the earth to receive direct rays from the sun

solstice

June 21, marks the beginning of summer in the northern hemisphere. Brings the northern hemisphere its longest day of sunlight

tropic of capricorn

December 21, 23 1/2 degrees S. marks the beginning winter. Southernmost point on the earth.

greenhouse effect

the capacity of certain gases in the atmosphere to trap heat, thereby heating the earth

greenhouse effect

without this, the earth would be too cold for most living things

global warming

gradual warming of the earth and its atmosphere that may be caused in part by pollution and by an increase in the greenhouse effect

low latitudes

between 30 degrees S and 30 degrees N. receives direct rays from the sun. Hot

high latitudes

between 60 degrees N to 90 degrees N and 60 degrees S and 90 degrees S. Only gets indirect sunlight. Cold

Arctic Circle

latitude 66 1/2 degrees N. Experiences continuous daylight or sunlight

antarctic circle

latitude 66 1/2 degrees S. experiences continuous daylight or twilight

midlatitudes

have temperate climates

elevation

height above the level of the sea

Quito, Ecuador

Very cold. on the Andes Mountains and directly on the equator

prevailing winds

global winds blow in fairly constant pattern

coriolis effect

causes prevailing winds to blow diagonally rather than along strict North-South or East-West directions

dolodrums

when global winds are directed North and South, leaving a narrow, generally windless band

currents

cold and warm streams of water

ocean currents

moving streams of water created by winds blowing across the ocean

El Niño

name given to the short term periodic change in the location of warm and cold water masses in the Pacific Ocean

windward

The side of a mountain that faces the oncoming wind

leeward

the side of the mountain that is sheltered fron the wind. it is the drier side of the mountain.

rain shadow

dry area found on the leeward side of a mountain range

natural vegetation

the plant life that grows in an area where the natural environment is unchanged by human activity

oasis

an area of lush vegetation

coniferous

vegetation that has cones and needle-shaped leaves, including evergreens, keep their foliage throughout the winter

deciduous

falling off or shed seasonally or periodically, Trees such as oak and maple, which lose their leaves in autumn

mixed forest

forest with both coniferous and deciduous trees

prairie

an inland grassland area

permafrost

permanently frozen layer of soil beneath the surface of the ground

hypothesis

a scientific explanation for an event

smog

haze caused by the interaction of ultraviolet solar radiation with chemical fumes from automobile exhausts and other pollution sources

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