All Entries in the "Earth Science" Category

Rocks: Properties of Rocks and Minerals

Differences between minerals and rocks
A mineral is a naturally occurring solid with a definite chemical composition and a specific crystalline structure.
A rock is an aggregate of one or more minerals.
A rock may also include organic remains and mineraloids.
Some rocks are predominantly composed of just one mineral.

The Constellations

The Egyptians are already had some knowledge about the motions of the sun, the moon, and the planets a long, long time ago.  They believed that these were gods.  They studied the positions of planets and stars so that they could foretell events.

Tides: High Tide and Low Tide

The position of the moon relative to the earth causes lunar tide.

Tides are the rhythmic rise and fall of ocean or sea water caused by the combined effects of the rotation of the Earth and the gravitational forces exerted by the Moon and the Sun.

Phases of the Moon

The moon rotates on its axis and revolves around the sun.  It always follows the earth in its trip around the sun.  The moon has same length of time for its rotation and revolution.  It takes the moon about 28 days to rotate on its axis and revolve around the earth.  This happens because during [...]

The Sun, The Moon, and The Stars

The sun is the center of the solar system.  The solar system is the official name of the sun’s family which includes nine planets, many moons, and stars.