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Quizzes Created: 1 | Total Attempts: 15
Questions: 10 | Attempts: 15

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• 1.

### Which type of rock  listed below covers the majority of the Earth's land surface?I. IgneousII. SedimentaryIII. Metamorphic

• A.

I Only

• B.

II Only

• C.

III Only

• D.

The Earth's land surface is covered equally by all three

• E.

None of these. The Earth's surface is mostly covered by water.

B. II Only
Explanation
Sedimentary rocks cover the majority of the Earth's land surface. This is because sedimentary rocks are formed from the accumulation and compaction of sediments over time. These sediments can come from various sources such as weathering and erosion of existing rocks, deposition of organic matter, or precipitation from water. As these sediments accumulate and undergo compaction, they form layers of sedimentary rock. Over time, these layers can build up to cover large areas of the Earth's land surface.

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• 2.

### South Africa's net population growth was 0.9 % in 2008. what is its approximate doubling time?

• A.

9 Years

• B.

19 Years

• C.

78 Years

• D.

46 Years

• E.

27 Years

C. 78 Years
Explanation
The approximate doubling time can be calculated using the rule of 70, which states that the doubling time is approximately 70 divided by the growth rate. In this case, the growth rate is 0.9%, so the doubling time is approximately 70 divided by 0.9, which equals 77.78 years. Since the given options are rounded, the closest option is 78 years.

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• 3.

### Which of the following is not one of the nuclear changes matter can undergo?

• A.

Fission

• B.

Evaporation

• C.

Fusion

• D.

Decay

• E.

All of these are nuclear changes

B. Evaporation
Explanation
Evaporation is not one of the nuclear changes matter can undergo because it is a physical process that involves the conversion of a liquid into a gas, without any changes in the atomic or nuclear structure of the substance. Nuclear changes, on the other hand, involve alterations in the nucleus of an atom, such as fission (splitting of atomic nuclei), fusion (combining of atomic nuclei), and decay (radioactive decay of atomic nuclei). Therefore, evaporation does not fall under the category of nuclear changes.

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• 4.

### Approximately 26 million children each year suffer irreversible brain damage from lack of which of the following?

• A.

Cobalt

• B.

Iodine

• C.

Iron

• D.

Phosphorus

• E.

Calcium

B. Iodine
Explanation
Iodine is necessary for the production of thyroid hormones, which are crucial for brain development in children. A lack of iodine can lead to a condition called iodine deficiency disorder (IDD), which can cause irreversible brain damage in children. Therefore, the correct answer is iodine.

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• 5.

### Approximately what percentage of the world's freshwater is readily available for humans use?

• A.

70%

• B.

30%

• C.

10%

• D.

3%

• E.

Less than 1%

E. Less than 1%
Explanation
Less than 1% of the world's freshwater is readily available for human use. This means that the majority of the world's freshwater is either locked up in ice caps and glaciers or is too polluted to be used. With such a limited amount of freshwater accessible, it is crucial for humans to conserve and manage this precious resource effectively.

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• 6.

### Of the estimated 50,000 plant species that people can eat, only ____ of them supply an estimated 90% of the world's food calories.

• A.

1,000

• B.

150

• C.

15

• D.

5

• E.

4

C. 15
Explanation
Out of the estimated 50,000 plant species that are edible for humans, only 15 of them provide approximately 90% of the world's food calories. This means that a small fraction of the available plant species are responsible for the majority of the global food supply.

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• 7.

### Which country is adding 100,000 new jobs per year in the renewable energy industry and is rapidly becoming the world leader in making and selling wind turbines and solar cells to other countries?

• A.

United States

• B.

Korea

• C.

Germany

• D.

Sweden

• E.

China

E. China
Explanation
China is the correct answer because it is adding 100,000 new jobs per year in the renewable energy industry. Additionally, China is rapidly becoming the world leader in making and selling wind turbines and solar cells to other countries. This indicates that China is experiencing significant growth and success in the renewable energy sector, making it a prominent player in the global market.

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• 8.

### In the United States, the largest single component of Municipal Solid Waste is

• A.

Paper

• B.

Plastic

• C.

Glass

• D.

Food

• E.

Wood

A. Paper
Explanation
Paper is the correct answer because it is the largest single component of Municipal Solid Waste in the United States. This is due to the high consumption and disposal rate of paper products such as newspapers, magazines, packaging materials, and office paper. Recycling efforts have been implemented to reduce paper waste, but it still remains a significant contributor to municipal solid waste.

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• 9.

### In the united states, which sector consumes the most water annually?

• A.

Energy production

• B.

Industrial

• C.

Residential/Community

• D.

Agricultural

• E.

Commercial

A. Energy production
Explanation
Energy production consumes the most water annually in the United States. This is because energy production requires large amounts of water for cooling purposes in power plants, particularly in thermoelectric power generation. Water is used to cool the power plants, and a significant portion of this water is lost through evaporation. Additionally, water is also used in the extraction and processing of fossil fuels, further contributing to the high water consumption in the energy production sector.

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• 10.

### The measurement of the concentration of hydrogen ions compared to the concentration of hydroxide ions in a solution is called

• A.

Ionization

• B.

Hardness

• C.

PH

• D.

Isotopes

• E.

Covalent Bonding

C. PH
Explanation
pH is the correct answer because it refers to the measurement of the concentration of hydrogen ions compared to the concentration of hydroxide ions in a solution. It is a scale that ranges from 0 to 14, with 7 being neutral, values below 7 being acidic, and values above 7 being alkaline or basic. The pH scale is commonly used in chemistry and biology to determine the acidity or alkalinity of a substance.

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