Answer: c. Oxygen, silicon, and aluminium
Explanation:
The common elements in the Earth's crust in order of decreasing abundance are as follows:
Oxygen: Oxygen is the most abundant element on earth's crust. It makes up 46.6%. It exists as compound of the silicate minerals. It is used for industrial, commercial and medical purposes.
Silicon: Silicon is the second most common and abundant element on the earth crust. It makes up the concentration of 27.7%. It combines with the minerals of silica to form the silicate minerals. It is used for the purpose of ceramics, cosmetics, glass and other products.
Aluminium: Aluminium is the third most common and abundant element on the earth crust. It makes up the concentration of 8.1%. The aluminum exists in the form of aluminium oxide, potassium aluminium sulfate and aluminium hydroxide. It is used for the purpose of manufacture of rockets, machinery and automobiles.
Answer:
PERMAFROST LAYER
Explanation:
Permafrost layer is usually defined as the thick layer of soil that is mixed with the broken rock fragments and other sediments, and are covered by ice throughout the year. These are mostly found in the higher latitudinal region, where the thickness of these layers ranges from a few meters to tens and hundreds of meters. The melting of these layers in these regions leads to an increase in the sea level.
For example, the permafrost layers of tundra and subarctic zones in Russia and its nearby areas, which have a thickness of about three meters.
Answer:
A student might practice the earthquake drill (Drop, cover, and hold on during your earthquake drill) if they lived in the middle of a tectonic plate.
difficult
Explanation:
The process of approving the constitution is best described as a difficult process. When a constitution is approved, it is said to be ratified. The ratification of a constitution is a very difficult procedure.
- A constitution is a set of laws or rules that governs a particular nation.
- Constitutions are usually drawn up by the legislative arm of the government.
- The legislatures are the lawmakers in a country.
- Constitutions of a nation takes several years to get approval due to diverse opinions that must be considered.
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The negative impacts of radiation on a country's economy may include :
- Increased rate of mortality
- Destruction of food crops and cattles
- Environmental contamination
- Long term health complications
Radiation has proven to be very useful in medicine, power, defense and other sectors if adequately deployed. However, it's negative impact can also be overwhelming.
Some of the negative impacts of radiation include :
- Radiation could cause death thousand to millions of people within minutes. Such could result from bomb attacks or release of toxic nuclear substances into the environment.
- The effect of radiation does not only pose risk to life, it could also lead to destruction of crops and cattles. Causing famine and unquantifiable losses.
- Nuclear radiation may be so deadly that it renders several Radius or perimeter of an environment inhabitable. Such is the situation of Hiroshima and Nagasaki.
- Nuclear radiation often poses the risk of terminal diseases such as cancer upon exposure .
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