Presentation on theme: "Earth Processes Part 4: Coriolis Effect, Tides, and Seasons"— Presentation transcript:
1Earth Processes Part 4: Coriolis Effect, Tides, and Seasons
2Coriolis Effect/Force As air begins flowing from high to low pressure, the Earth rotates under it, making the wind follow a curved path.Winds follow curved paths across the Earth.In the Northern Hemisphere, the wind turns to the right.…clockwise.In the Southern Hemisphere, it turns to the left.…counterclockwise.The Coriolis force is zero at the equator.
5Ocean Tides.Tides are the periodic rise and fall of the ocean waters. They are caused by the gravitational pulls of the Moon and rotation of the Earth.As the Earth rotates, the moon's gravitational attraction is greatest on side closest to moon and opposite side….creating “tidal bulges”.As the Earth rotates, the tidal bulges move across the oceans causing two daily high and two daily low tides. (go to internet!!!)
6RotationsIt takes one day (24 hours) for the Earth to make full rotation on its own axis.It takes 1 year for the Earth to revolve one time around Sun.It takes 28 days for the Moon to rotate once around the Earth.
7Tides caused by the Moon Tides caused by the Moon. Note that the length of the arrows is proportional to the strength of gravitational force.
8Spring Tides - Strong tides occur when the Moon and sun line up Spring Tides - Strong tides occur when the Moon and sun line up. Happen in full or new moon only.
15Intertidal ZoneThe intertidal area (also called the littoral zone) is where the land and sea meet, between the high and low tide zones.This complex marine ecosystem is found along coastlines worldwide. It is rich in nutrients and oxygen and is home to a variety of organisms.
17Seasons of EarthSeasons are caused by tilt of the Earth.The seasons have nothing to do with how far the Earth is from the Sun.Tilt = 23.5 degrees
18Equator always the hottest. When northern hemisphere tilts towards sun (left) = summerTilts away from sun = winter
19Notice that when the Northern hemisphere is pointed toward the Sun, the Southern hemisphere is pointed away, and vice versa. So when it is summer in the north, it is winter in the south and vice versa