By Jennifer A. Grier Ph.D., Andrew S. Rivkin
This quantity within the Greenwood publications to the Universe sequence covers the internal planets—Mercury, Venus, Earth, and Mars. Thematic chapters speak about the entire many components of astronomical learn surrounding every one topic, offering readers with the main updated realizing of present wisdom and the ways that it's been obtained.Like the entire books during this sequence, internal Planets is scientifically sound, yet written with the scholar in brain. it really is a great first step for learning the fascinating medical discoveries of the Earth and its closest acquaintances.
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Additional info for Guide to the Universe: Inner Planets (Greenwood Guides to the Universe)
The water content of rocks, their temperatures, the pressures they are subjected to, and if they are whole, riddled with fractures, or even in pieces are all factors in how the rocks act under stress. Gravity Gravity is a fundamental force that puts stress on planetary rocks, as well as governs the motions of some rocks after a major event like a landslide. Tidal forces push and pull rocks within a planet, heating the interior, but also put stress on planetary rocks that compresses them in some places and pulls them apart in others.
What is responsible for the difference? We know that fewer craters are being formed now than in the past, but there are still impact events in the inner solar system. Since there is no reason that projectiles should prefer to strike the Moon, rather than the Earth, it is highly likely that something has wiped out the terrestrial craters. Knowing what we do about the Earth, this isn’t difficult to believe. Wind, rain, human activity, vegetation, earthquakes, volcanoes and much more all serve to change the Earth’s surface.
Magma chambers can be compressed as the solid rock around them is pushed inward by continued deformation. Magma may contain other volatile gasses trapped or dissolved within it, like water vapor, carbon dioxide, or sulfur dioxide. These gasses can provide additional pressure, forcing the magma upward. Eventually, through a combination of processes, liquid magma can erupt onto the surface as lava. Alternately it may also remain trapped underground and cool there as an intrusion. Exactly how and where magma erupts, the nature and duration of the eruption, and then the landforms that result, are often a function of the chemistry of the magma, as well as relationships between volcanic and tectonic activity unique to a given planet.