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science facts sec1&2

important facts

what causes day and night on earth? earth spinning on its axis
how many km per hour does a point in the equator rotate? 1,600 km
what is a leap year? a year which has 366 days instead of 365
how often does a leap yaer occur? once every 4 years
why does a leap year happen once every 4 years? because in a year there are 365 and 1/4 days. four 1/4's equal a day. one extra day
why does the eart5h have seasons? because its axis is tilted as it moves around the sun
what causes the phases of the moon, tides and eclipses? the position of the earth, moon and sun
how many days does it take the moon to revolve once around earth? 27.3 dyas
how many days in one year on the moon? 27.3
what causes the phases of the moon you see? how much of the sunlit side of moon faces earth
what cause tides? the gravity of the moon pulling the water
when there is a high tide on the side of earth facing the moon, why is it high tide on the side of the earth thats away from the moon at the same time? the moons gravity pulls earth towards it a little bit also. so as the earth moves towards the moon, the water on the other side of earth is left behind.
what is the event when the moons shadow hits earth or the earths shadow hits the moon? an eclipse.
Created by: pragu :)