Presentation on theme: "Thanks to the pull of gravity!. The moon pulls the ocean waters on its closest side of the Earth causing the ocean waters to bulge toward to the moon."— Presentation transcript:
The moon pulls the ocean waters on its closest side of the Earth causing the ocean waters to bulge toward to the moon. When this occurs we call it a “Direct High Tide”. On the far side of the Earth from the Moon, the oceans are pulled less strongly so we call this an “Indirect High Tide”. Halfway between these to high tides, low tides are formed as water is pulled towards the high tide areas.
The Sun’s gravitational pull can strengthen or weaken the influence of the Moon’s gravity on Earth and tidal actions. When the moon is in a new or full moon phase, the allignment of the Sun and Moon work together creating very high and very low tides which happen twice a month called, “Spring Tides”. The difference between high and low tides is called a, “Tidal Range”.
When the Moon is at quarter phases with the Sun at a 90° angle from the Moon, the sun weakens the Moon’s gravitational force creating a small tidal range (not very high nor very low tides). These are called, “Neap Tides”.
What would happen to Earth’s tidal Actions if there were no moon? Check it out! Make notes to answer this questions while watching the video clip! http://www.youtube.com/watch?v=Ae mGLbo8__k http://www.youtube.com/watch?v=Ae mGLbo8__k “Earth Without the Moon” (6 minutes)