Free Earth Science Essay Sample

Part A

Question 1 A mineral is the formation of a stable chemical that occurs naturally through the biogeochemical processes and possesses both the chemical and physical properties. Streak is the color that helps to identify minerals in powder form.

Question 2 The Sunlight or Euphotic area allows enough sunlight to penetrate through, and that enables photosynthesis to take place. Dysphotic area allows some sunlight but can not allow photosynthesis to take place. The last zone is the Aphotic zone that is extremely deep and no sunlight reaches there.

The locomotion of surface currents moved by the wind is fairly instinctive predominant. The driving force is different in density, caused by concentration and temperature (the more saline the denser and, the colder the denser). Ocean currents are due to tides but mostly occur in the coastal line as tidal currents occur in the deep ocean.

Question 3 A thunderstorm occurs as the acoustic effect caused by lightening on the environment atmosphere known as thunder. They form as warm, moist air inside warm, moist air masses mix at the edge of the front. A tornado is a strong, dangerous, cyclic movement of air in contact with the surface of the earth and a cumulonimbus cloud. A hurricane is a strong wind accompanied by flooding rain during the summer and fall that forms due to the rapid condensation of heat.

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Part B

Question 1 There are a lot of minerals that share one color. They can have more than one color causing confusion in identifying them.

Question 2 Intrusive igneous rocks are cooled below the earth surface. They  have larger crystals as they took longer to crystallize like granite while the extrusive rocks are formed from hot lava or below the earth surface. They have many tiny crystals, or lack crystals because of the rapid cooling environment where they appear.

Question 3 Epicenter is the point on the earth surface directly above the earthquake starting point. The focus, on the other hand, is the area along a line of weakness where the first earthquake motion occurs.

Question 4 Frost wedging is a physical mechanical weathering that causes the repeat free  thaw action of water during extremely cold weather.

Question 5 This theory explains that the planet Earth was one continent, which eventually separated into plates. They drifted forming the seven continents and that their positions can still fit well into each other and make one continent.

Question 6 Glacial ice forms as snow falls on a plateau and does not thaw in summer, forming other  layers of crystals, and as time passes the snow ice slides over due to gravitation forming a glacier.

Question 7 Weather is the daily atmospheric condition of a place at a period. Climate is the prevailing weather condition of an area observed over a certain time frame, for example, winter or summer.

Question 8 Cumulonimbus cloud is a towering vertical mass that is exceptionally high, dense, and involved in thunderstorms and other inclement weather. They make lightning through the heart of the cloud as a result of atmospheric instability.

Question 9 Terrestrial planets surfaces are stable. The core is of lesser density. The Jovian planets surfaces are in gaseous form, but the core is denser than of the terrestrial planets.

Question 10 A light year is a measure of the speed that light moves in one year. It helps the astronomers to calculate the distance in the galaxy, in astronomical unit.


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