This week in science we started learning about the phases of the moon. We learned that the first phase of the moon is New Moon. The next stages is are Cresant Moon, Half Moon, Gibbous Moon, and Full Moon. Then they go backwards and after that they repeat. When the moon seems to get bigger it is actually only getting more illuminated which gives the illusion of getting bigger. This is called waxing. When the same thing happens but instead of the moon gets bigger, it gets smaller, it is called Waning.Equinox is when the sun is at a direct point above the eqauter. When we have equinoxs the night is the same amount of time as the day.
We learned about tides. Neap Tides are when the Moon and Sun are at right angles. The forces cancel each other out partially. Then there are tides but there isn't much of a difference between high tide and low tide. We also learned about Spring Tides. Spring Tides are when the moon and sun are lined up with the earth and their forces combine. The water is pulled toward them. There is a big difference between high and low tide. A neumonic device to remeber sping tides is "the water seems to spring off the earth".
Friday, May 22, 2009
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