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Changes on the Earth’s Surface. Earth. Rotation spins on axis Axis runs through North and South Poles Revolution Orbits the Sun 365.24 days Leap Year Tilt Axis is tilted 23.5 degrees. Latitudinal Regions. Tropics Warm, low-latitude areas (near equator) Polar regions - PowerPoint PPT Presentation
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CHANGES ON THE EARTH’S SURFACE
Earth
Rotation spins on axis
Axis runs through North and South Poles Revolution
Orbits the Sun 365.24 days Leap Year
Tilt Axis is tilted 23.5 degrees
Latitudinal Regions
Tropics Warm, low-latitude areas (near equator)
Polar regions Cold, high-latitude areas (near poles)
Middle latitudes Areas between tropics and polar regions
Seasons
Because the Earth tilts, the angle of the Sun’s rays vary throughout the year. Direct rays = warmer Indirect rays = cooler
This is why we have seasons!
Types of Seasons
Temperature-based Spring, Summer, Fall, Winter
Precipitation-based Wet, Dry
Solstices and Equinoxes
Solstice Earth’s poles point at their greatest angle
toward or away from the Sun 21 December and 21 June
Equinox equi = equal nox = night Poles are at 90 degree angle to the Sun 21 March and 22 September
Solstices
December Solstice North Pole points away from Sun Sun strikes Tropic of Capricorn directly 24 hours of daylight in Antarctic Circle
June Solstice South Pole points away from Sun Sun strikes Tropic of Cancer directly 24 hours of daylight in Arctic Circle
Weathering
Process by which rocks break and decay over time
Chemical Weathering Substances or chemicals in the air dissolve
rock Mechanical Weathering
Physical processes Deserts – heating and cooling Mountains – freezing and thawing Tree roots
Sediment Smaller particles of gravel, sand, and mud
Erosion
Movement of surface material from one location to another
Caused by water, wind, and ice
Water Erosion
Most important force of erosion Rapid erosion
Rainfall washes out areas with few points Water erosion
Channels of water cut into the earth Wave erosion
Changing shorelines
Wind Erosion
Abrasion Blasts sand particles against rock
Displacement Blows sand and dust to new location
Sand dunes Loess
Fine-grained, windblown soil Very fertile
Ice Erosion
Glaciers Thick mass of ice
Erode rock and move sediment Moraine
Accumulation of rock and soil from glacial erosion
I don’t know how this fits into this lesson…
Acid rain Chemicals in air
pollution combine with water in air
Produces a mild acid Can damage trees and
kill fish in lakes