Define aphelion and perihelion, Explain reasons of day-night and seasons alterna
ID: 233484 • Letter: D
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Define aphelion and perihelion, Explain reasons of day-night and seasons alternations? the yearly change of distance from Sun affect Earth dimate and weatter? (drawing) Describe Earth interior, (drawing) Mow earthquakes expand our knowledge of Earth. Define the three types of plate boundaries and give examples of each. Describe the inter; of oceanic and continental plates. Mow the plate tectonic theory explains marine fossils tops of modern mountains? Describe the difference between sequences of layers of rocks folding and faulting of Define anticlines and synclines. horst and grabbers. (drawing) Describe four mechanisms mountain building on Earth. Igneous, sedimentary and metamorphic rocks: origins and types. What is single most characteristic feature of sedimentary rocks? Describe golden ores and gold extraction. What is the difference between karat and Describe mechanisms of lunar and solar eclipses. (drawing) Define renewable and non-renewable resources. What is the difference between reserves? What are ores? Describe the process of ores creation by hydrothermal solution weathering and erosion. Define and describe sedimentary systems, (drawing) Oil and natural gas: use, origins, types of traps, (drawing) Rock cycle - describe the process of re-cycling igneous, sedimentary and metamorphic (drawing). Relative and absolute dating. Fossils and correlation of geological events. In simple test how to detect a diamond from other glassy minerals. Explain the different between carat and karat .Explanation / Answer
3) perihelion is a point on the orbit of a planet or comet which is nearest to the sun or a star .
Aphelion is a point on the orbit of a planet or comet which is farthest from the sun or a star .
Day and night occurs on the earth due to rotation of earth on its axis . The side of the earth which receives the sun light have day while the other part have night at that time. The axis of earth is tilted by an angle of 23.5 ° with the vertical . This causes uneqal distribution of light and heat by sun light during different parts in its revolution . That is during different time in a year . The change in distance of the earth from sun also contribute to the season change on earth . The amount of insolation also depends on the distance of earth from the sun.
4 ) The interior of earth have many layers one above other . The different layers in correct sequence from out - inside are
Crust - it is solid made up of different kinds of rocks .
Mantle - it contains viscous liquid .
Outer core - its temperature is very high and contains liquid iron .
Inner core - it is solid and mainly made up of Iron . The knowledge of earthquakes is helpful in understanding the earth's interior . It ordinates at places where tectonic plates experience mutual relative motion .
5 ) the three types of plate boundaries are
Convergent plates - these plate move closer to each other . These plates are responsible for the formation of some big mountain ranges like the Himalayas , the A ndes , etc
Divergent - these drift apart from each other . Rifts and rift valleys are formed due to these .
Transform - these are the plates that slides over wach other . The movement is horizontal and the friction between the plates causes earthquakes .
The tectonic plates that forms floor of oceans are called ocean plate . These plates are denser and thinner than continental plates . These are composwst of rocks rich in iron and magnesium.
The continental plates are made up of all three types of rocks .
During an earthquake in an ocean floor the continental plate and a oceanic plate are involved and this might result in formation of mountain , Andes is an example. This is how marine fossils are found on top of mountain .
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