Tides. Tides are the rise and fall of ocean water that occurs about every 12.5 hours. They are caused by the gravity of the sun and moon on Earth. As.

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Presentation transcript:

Tides

Tides are the rise and fall of ocean water that occurs about every 12.5 hours. They are caused by the gravity of the sun and moon on Earth. As the alignment of the moon and sun changes, they pull on the oceans of the Earth with changing strength.

A Spring Tide is when there is the greatest difference between the high tide and the low tide. It has the highest high tide. It has the lowest low tide.

When the sun, moon, and Earth are in perfect alignment, it is a new moon. The gravitational pull is strongest, causing a spring tide. A spring tide is when there is the greatest difference between low and high tide. This also happens at the full moon phase.

A Neap Tide is when there is the least difference between the high tide and the low tide. It has the lowest high tide. It has the highest low tide.

When the moon is in its first quarter, the gravitational pull is at right angles to the pull of the sun. This causes a neap tide in which the difference between low and high tide is the lowest. This also happens at the third quarter phase of the moon.

Which has a greater effect on tides? The Moon or the Sun? Two factors that affect gravity: Mass Distance The moon has less mass but closer. The sun has more mass but farther away.

Win a Homework Pass Write a 3-5 sentence paragraph that answers the question “Which has the greatest effect on Tides? The moon or the sun? Describes factors that affect gravity. States which has the greatest effect. Explains why. Cites reliable resource. (No Wikipedia, Wiki- answers etc…) In your own words!!!