Thursday, September 20, 2018
Natural and environmental threats:
Natural and environmental threats:
Many places are subject to earthquakes, landslides, tsunamis, volcanic eruptions, tornadoes, sinkholes, blizzards, floods, droughts, wild fires and other disasters. In many local areas, all the man-made air and water pollution, acid rain and toxic substances, crop damage, loss of wildlife, species extinction, deterioration in soil capacity, soil erosion and erosion are many.
There is a scientific consensus that human activities are responsible for the rise of global warming such as industrial carbon-dioxide emissions. Because of which changes like melting of glaciers and ice sheets have been predicted, the melting of snow in mountain ranges at extreme extreme temperatures, significant changes in weather and global growth in average sea levels are included.
Earth's only natural satellite:
Moon is the only natural satellite of the Earth. It is the fifth largest natural satellite in the solar system whose diameter is one fourth of the Earth and the mass is 1/81. Moon is the second most dense satellite after Jupiter's satellite lo. After the sun, the brightest body in the sky is the moon.
Marine tides and reflux are due to the Moon's gravitational power. The instantaneous orbital distance of the Moon is 30 times the diameter of the Earth, so the size of the sun and the moon in the sky is always alike. The distance from the middle of the earth to the middle of the moon is 384,803 kilometers.
This distance is 30 times the circumference of the Earth. Gravity on the Moon is 1/6 from the Earth. It completes the orbiting of the earth in 27.3 days and also places a full circle around its axis in 27.3 days. This is why we always see only one aspect of the Moon from Earth.
If you stand on the moon and look at the earth, the earth will be clearly seen rotating on its axis, but its position in the sky will always remain steady, that means that the Earth will remain silent for many years, it will not be exhausted from its place. Because of the Earth-Moon-Sun Geometry, the moon conditions vary in every 29.5 days.
Asteroids and Artificial Satellites:
There are at least five co-orbital asteroids in Earth with 3753 Kruthane and 2002 AA 29. A Trojan Asteroids 2010 tie 7, the leading lagrez travels around the Sun in the orbit of the Earth around the triangular point L4. A small asteroid near the Earth reaches near the Earth Moon system every twenty years.
During this, it seems to revolve around the Earth for a brief period. By June 2016, 1419 man-made satellites are orbiting the Earth. At present, the oldest and inactive satellite Vanguard in the classroom is flying over 1 and 16,000 pieces of space debris. Earth's largest artificial satellite, the International Space Station.
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