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Questions and Answers
Which layer of the atmosphere contains the air we breathe?
Which layer of the atmosphere contains the air we breathe?
- Stratosphere
- Mesosphere
- Troposphere (correct)
- Thermosphere
What is the most abundant gas in the troposphere?
What is the most abundant gas in the troposphere?
- Nitrogen (N2) (correct)
- Methane (CH4)
- Carbon Dioxide (CO2)
- Oxygen (O2)
Which atmospheric layer is above the troposphere?
Which atmospheric layer is above the troposphere?
- Mesosphere
- Exosphere
- Stratosphere (correct)
- Thermosphere
What is the main component of the geosphere?
What is the main component of the geosphere?
Which spherical system includes living things?
Which spherical system includes living things?
True or false: The earth's life-support system consists of three main spherical systems that interact with one another.
True or false: The earth's life-support system consists of three main spherical systems that interact with one another.
True or false: The atmosphere is held to the earth by magnetism.
True or false: The atmosphere is held to the earth by magnetism.
True or false: The stratosphere is the layer in which the earth's weather occurs.
True or false: The stratosphere is the layer in which the earth's weather occurs.
True or false: The biosphere includes only non-living things.
True or false: The biosphere includes only non-living things.
True or false: The geosphere consists of rock, soil, and sediment.
True or false: The geosphere consists of rock, soil, and sediment.
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Study Notes
Earth's Life-Support System
- The earth's life-support system consists of four main spherical systems: atmosphere, hydrosphere, geosphere, and biosphere.
Atmosphere
- The atmosphere is a spherical mass of air surrounding the earth's surface, held by gravity.
- It has layers, with the innermost layer being the troposphere, extending 19 km (12 miles) above sea level at the equator and 6 km (4 miles) above the North and South Poles.
- The troposphere contains the air we breathe, composed of 78% nitrogen (N2), 21% oxygen (O2), and 1% water vapor, carbon dioxide, and methane.
- The troposphere is where the earth's weather occurs and life can survive.
- The stratosphere is the atmospheric layer above the troposphere, reaching 17-50 km (11-31 miles) above the earth's surface.
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