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Earth's crust, Types of rocks, Igneous rocks, Sedimentary rocks & Metamorphic rocks

Volcanic rocks contain small circular holes due to the extruding of gases from volcanic flows during their cooling and formation of rock. The crystals of minerals that form the plutonic igneous rock are large-sized because magma at depth gets cool slowly, therefore minerals take a long time to crystalline, so their crystals are large-sized.

Igneous rocks, Sedimentary rocks & Metamorphic rocks

The crystals of minerals that form the volcanic igneous rock are small-sized because the minerals that form it don't take the time required for crystallization, where lava cools quickly on the surface, therefore their crystals become small-sized.

The components of basalt rock cannot be seen by the naked eye because it is a volcanic rock that has very small crystals. Some kinds of marble are coloured and others are white because if it contains impurities, it is coloured and if it is pure, its colour is white.

The cohesion of layers of sedimentary rocks increases by passing time because the sediments that exist in the lower layers are exposed to high pressure resulted from the weights of the deposits above them, this causes a decrease in the ratio of water existing between the grains.

The tropical radius is larger than the polar radius because the Earth is slightly flattened at its poles and indented outward at the equator. Concerning the volume, the Earth occupies the medium position in the solar system because it is the biggest inner planet and it is smaller than any planet from the outer planets.

Importance of the Earth's atmosphere

  • Importance of oxygen gas: It is used in the respiration process of living organisms. It helps in the combustion (burning) process of fuels.
  • Importance of nitrogen gas: It reduces the effect of oxygen gas during burning processes. Plants use it to form proteins.
  • Importance of carbon dioxide gas: It is used by green plants in the photosynthesis process to form food for other living organisms including people.

The great expansion of atmosphere in the space helps in:

  • Burning millions of small falling meteors completely before reaching the Earth's surface.
  • Reducing the high speed of large meteorites and burning a part of them before they hit the Earth's surface.

Some rocky masses that fall from the space don't reach the Earth's surface because the expansion of the atmosphere in space helps in burning millions of small falling meteors completely before reaching the Earth's surface.

Earth's gravity makes life continue. The Earth has a force of gravity that makes life possible through Constancy and steadfastness of objects and living organisms on its surface. The steadfastness of the hydrosphere position on its surface. Keeping the Earth surrounded by the atmosphere.

The presence of life on the surface of the Earth planet only due to the presence of hydrosphere. The presence of the atmospheric envelope containing oxygen gas which is needed for life. its temperature is suitable during both day and night. Its atmospheric pressure and its gravitational force are suitable.

The Earth (as the egg) consists of three layers arranged from outside to inside as follows: The first layer is Earth's crust, the second layer is the mantle, the third is the core.

The Earth consists of many layers, each layer has its own characteristics as a result of the revolution of the Earth around its centre, the heavy metals descended towards the centre of the Earth and the light components in density ascended upwards, this led to the formation of a number of Earth's layers.

Scientists think that the inner part of the Earth was in a molten form due to the high temperature of Earth's core. The Earth's inner core is rich in iron and nickel. Iron and nickel elements are collected around the centre of the Earth because they are from heavy elements that descend towards the centre of the Earth due to its rotation around its centre.

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