Lithosphere -The topmost solid part of the Earth
Hydrosphere - about 70% of Earth's surface is covered by water.
Atmosphere - Thick blanket of gas surrounding the Earth.
Rotation - the Earth's rotation on it's own axis in 24 hours.
Revolution - the Earth's revolution around the sun in 365 days = 1 year.
Shadow - Earth and moon revolve around the sun and block out some of the sunlight.
Eclipse - may be total or partial obscuring of one celestial body by another.
Lunar Eclipse - occurs when the moon passes through Earth's shadow.
Three types of Lunar Eclipses
Solar Eclipse - occurs when the moon passes between Earth and sun and it's shadow falls on Earth.
The four types of Solar Eclipses
One year - 365 days
Summer solstise - on June 20 or 21 every year, North Pole experiences Sumner solstise.
Winter solstise - December 21 or 22, the sun seems to move lower and lower in the sky.
Equinox- means "equal night".
Vernal or Spring equinox - which generally falls on March 20 or 21 of every year.
Autumnal equinox - which falls on September 21 or 22 of every year.
High tide - the rise of water level due to the pull of the moon which usually happens every 12 hours.
Low tide - the lowest level of the ocean that occurs between two high tides.
Spring tides - during new moon and full moon, the lunar and solar tides together produce the larger spring tides.
Neap tides - during first and last quarters of the moon, lunar and solar tides produce the smaller tides.
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