Podcast
Questions and Answers
What percentage of the air in the atmosphere is contained in the troposphere?
What percentage of the air in the atmosphere is contained in the troposphere?
- 75% (correct)
- 90%
- 99%
- 50%
What is the rate of temperature decrease with height in the troposphere?
What is the rate of temperature decrease with height in the troposphere?
- 8°C per kilometre
- 5°C per kilometre
- 6.5°C per kilometre (correct)
- 7°C per kilometre
What is the name of the lowest part of the troposphere?
What is the name of the lowest part of the troposphere?
- The stratosphere
- The tropopause
- The atmosphere
- The boundary layer (correct)
Why does the air get cooler as you go higher in the troposphere?
Why does the air get cooler as you go higher in the troposphere?
What is the height of the tropopause at the poles?
What is the height of the tropopause at the poles?
What layer of the atmosphere extends from the tropopause to about 50 km?
What layer of the atmosphere extends from the tropopause to about 50 km?
What is the primary reason why ice floats on water?
What is the primary reason why ice floats on water?
What percentage of the human body is composed of water?
What percentage of the human body is composed of water?
What is the chemical symbol for water?
What is the chemical symbol for water?
What is the state of water at room temperature?
What is the state of water at room temperature?
What is the approximate percentage of the Earth's surface covered with water?
What is the approximate percentage of the Earth's surface covered with water?
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Study Notes
The Troposphere
- The lowest part of the atmosphere, where we live, containing most of the weather (clouds, rain, snow)
- Temperature decreases with altitude, approximately 6.5°C per kilometre
- Contains about 75% of the atmosphere's air and almost all of the water vapour
- The boundary layer is the lowest part, where air motion is influenced by the Earth's surface
- Turbulence in the boundary layer redistributes heat, moisture, pollutants, and atmospheric constituents
The Tropopause
- The top of the troposphere, varying in height from 0-10 km at the poles to 17-18 km near the equator
The Stratosphere
- Extends from the tropopause to about 50 km above the Earth's surface
- Contains much of the atmosphere's ozone
Properties of Water
- Water is essential for life on Earth, covering 65% of the planet's surface
- The human body is composed of 65% water
- Water is a colourless, tasteless, and odourless liquid
- Water exists in three states: solid (ice), liquid (water), and gas (steam)
- Water expands on cooling, with a lower density in its solid state, causing ice to float on water
- Water has high melting and boiling points
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