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Olympiad (Class 6) Earth and its environment — practice questions

Explore 59 free Earth and its environment questions in Olympiad (Class 6) General Knowledge. Open each question or exercise to read its content, reference answers and available explanation.

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Earth and its environment questions and exercises with answers

Showing questions 1–30 of 59.

If Earth's surface were cut into 10 equal parts, about how many parts would be ocean?Read the answer and worked solution →Clouds, rain and storms form mostly in which layer of the atmosphere?Read the answer and worked solution →The ozone layer, which absorbs harmful ultraviolet rays, lies mainly in which layer?Read the answer and worked solution →Temperatures drop with height to about -85 °C in which atmospheric layer?Read the answer and worked solution →Which gas makes up nearly four-fifths of the air we breathe?Read the answer and worked solution →Out of 100 litres of dry air, about how many litres are oxygen?Read the answer and worked solution →Colourful auroras are seen near 100 km above ground, in which layer?Read the answer and worked solution →Most meteors burn up on entering which layer of the atmosphere?Read the answer and worked solution →Why is flying through the stratosphere usually smooth for jet aircraft?Read the answer and worked solution →A climber goes up through the lowest atmospheric layer. What happens to air temperature?Read the answer and worked solution →Ozone (O3) in the upper air is formed from which gas?Read the answer and worked solution →Which life process built up the oxygen in today's air about 2.7 billion years ago?Read the answer and worked solution →Earth's crust is thinnest, about 6 km, under which of these?Read the answer and worked solution →The crust and the cold, rigid top of the upper mantle together form the what?Read the answer and worked solution →Which part of Earth's interior is liquid?Read the answer and worked solution →The inner core's radius is about one-fifth of Earth's. If Earth's radius is 6,000 km, the inner core radius is about?Read the answer and worked solution →Two tectonic plates that are pulled apart meet at what kind of boundary?Read the answer and worked solution →Plates that slide sideways past each other form which boundary?Read the answer and worked solution →Which pair of events is common along plate boundaries?Read the answer and worked solution →Which summit is the farthest point from Earth's centre because of the equatorial bulge?Read the answer and worked solution →The highest land point above sea level, at 8,848 m, is the top of which mountain?Read the answer and worked solution →The lowest point of the land surface lies at the shore of which water body?Read the answer and worked solution →A trench about 10,925 m below local sea level is named the what?Read the answer and worked solution →Earth's diameter is 43 km longer at the equator than at the poles. What causes this bulge?Read the answer and worked solution →Which ocean is the smallest of the five oceans?Read the answer and worked solution →Which ocean ranks second in size, after the Pacific?Read the answer and worked solution →A mean solar day lasts 86,400 seconds. How many hours is that?Read the answer and worked solution →Earth turns 360 degrees in 24 hours. How many degrees does it turn in one hour?Read the answer and worked solution →A year is about 365.25 days. How many extra days collect over four 365-day years?Read the answer and worked solution →Light from the Sun takes roughly how long to reach Earth?Read the answer and worked solution →

Worked practice questions

If Earth's surface were cut into 10 equal parts, about how many parts would be ocean?

  1. 3 parts
  2. 5 parts
  3. 7 parts
  4. 9 parts
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Correct answer: C. 7 parts

Ocean water covers about 70.8 percent of the surface, which is close to 7 parts out of 10.

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Clouds, rain and storms form mostly in which layer of the atmosphere?

  1. Troposphere
  2. Stratosphere
  3. Mesosphere
  4. Exosphere
Show answer and solution

Correct answer: A. Troposphere

Nearly all moisture is held in the lowest layer, so most weather happens there.

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The ozone layer, which absorbs harmful ultraviolet rays, lies mainly in which layer?

  1. Troposphere
  2. Stratosphere
  3. Thermosphere
  4. Exosphere
Show answer and solution

Correct answer: B. Stratosphere

Ozone in the stratosphere absorbs the Sun's ultraviolet radiation, which also warms that layer.

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