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February 25, 2014 WRITE THESE 2 QUESTIONS IN YOUR JOURNAL AND ANSWER THEM: What 3 major variables affect weather? 2. Provide an example of how conduction, convection, and radiation move heat in the atmosphere.

What 3 major variables affect weather? . Temperature Well where on Earth is the temperature (heat) greatest? Where is the least heat? Why? Humidity – amount of moisture in the air. Hygrometer measures this. Air Pressure – force exerted by tiny air particles. Measured with Barometer

How is Heat from the Sun transferred through the Atmosphere The sun's energy moves through space, then through the earth's atmosphere and finally reaches the earth's surface. The sun's radiation warms the earth's atmosphere and surface and becomes heat (thermal) energy. This heat energy is transferred through the atmosphere by one of three mechanisms: Radiation Conduction Convection

Conduction, Convection & Radiation Cause Weather Radiation – waves (Electromagnetic) Convection – oceans Conduction – air masses touch causing air to move

Ocean Currents

Hemisphere Half of the terrestrial globe or celestial sphere!

Equator An imaginary line that wraps around Earth at 0°latitude separating the surface into two equal parts!

Axis The imaginary line extending from the North Pole to the South Pole going through the center of Earth, which is the center of Earth’s rotation.

Tilt - 23.5 degrees The slant of Earth’s axis, which is 23.5° from vertical

Rotation – 24 hours The spinning of Earth on its axis that causes day and night to occur

Revolution – 1 year Earth’s year-long elliptical orbit around the Sun.

Seasons – Spring, Summer, Winter, Fall (Autumn)

Seasons – cont. Weather changes due to varied amounts of sunlight (both intensity and number of daylight hours received); Caused by the tilt of Earth during revolution!