Friday, 7 March 2014

What causes motion in the ocean?

Swimming, water skiing, surfing, fishing, these are all water related activities. Before you do these activities you need to check the tides. But what makes the tides go in and out? 

Tides are rises and falls of large bodies of water. Tides are caused by the gravitational interaction between the Earth and the Moon. The gravitational pull of the moon causes the oceans to bulge out in the direction of the moon. Since the Earth is also being pulled toward the moon, the water on the other side goes the opposite direction. Since the earth is rotating while this is happening, two tides occur each day.

Spring tides are especially strong tides. They occur when the Earth, the Sun, and the Moon are in a line. The gravitational pulls of the Moon and the Sun both do things to the tides. Spring tides occur during the full moon and the new moon.

High tides are also called king tides, and happen when the moon is pulling the water towards it, and low tides are when the moon is pushing the water away from it. King tides are another term for especially high tides. 
•Occur naturally and regularly
•Are predictable and expected
•Are not a everyday experience

Overall tides are a very big part of our everyday lives. They play a big part in making this world flow properly. Without tides the water would be still and there would be no surfing, water skiing, or fishing, because these activities all need tides.

By Lucy

1 comment:

  1. Lucy, I thought your introduction was great; it showed the importance of tides in everyday situations. The same goes for your conclusion. Generally your explanation flowed well although the paragraph about high and king tides could have been clearer. I could see clear evidence of causal connectives but there were no diagrams to aid your explanation.