Physical Geography

Pluto was discovered by clyde Tombaugh in 1930. According to International Astronomical Union (IAU) on August 24, 2006 Pluto is considered as dwarf planet. According to the definition, there are currently eight planets and five dwarf planets known in the solar system. The five dwarf planets are Pluto, Ceres, Eris,

An isohel is line drawn on a map connecting points that receive equal amounts of sunlight. It is derived from helios, meaning 'Sun.'

During the June solstice the Earth’s North Pole is tilted 23.5 degrees towards the Sun relative to the circle of illumination. This phenomenon keeps all places above latitude of 66.5 degrees N in 24 hours of sunlight, while locations below latitude of 66.5 degrees are in darkness.

A mushroom rock, also called rock pedestal or a pedestal rock, is a naturally occurring rock whose shape, as its name implies, strikingly resembles a mushroom.

Even though most of the Earth's surface is water, only 1% of it is fresh usable water. Ninety-seven percent of the Earth's water is saltwater, which contains too many minerals for humans to use untreated. Two percent of our water is "locked up" in ice caps and glaciers, leaving only one percent as usable fresh water.

Igneous rock is one of the three main rock types, the others being sedimentary and metamorphic rock. In terms of modes of occurrence, igneous rocks can be either intrusive (plutonic), extrusive (volcanic) or hypabyssal. Granite is an intrusive igneous rock which is formed from magma that cools and solidifies within the crust of a planet. They form central cores of major mountain ranges.

A solar eclipse is a type of eclipse that occurs when the Moon passes between the Sun and Earth, and the Moon fully or partially blocks (“occults”) the Sun. This can happen only at new moon, when the Sun and the Moon are in conjunction.

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