Podcast
Questions and Answers
What percentage of the Earth's surface is covered by the hydrosphere?
What percentage of the Earth's surface is covered by the hydrosphere?
- 70% (correct)
- 50%
- 80%
- 60%
Which of the following is NOT a form of water found in the hydrosphere?
Which of the following is NOT a form of water found in the hydrosphere?
- Rivers
- Atmosphere (correct)
- Lakes
- Ocean
What is the approximate age of the lithosphere?
What is the approximate age of the lithosphere?
- 3.8 billion years
- 1 billion years
- 2.3 billion years
- 4.6 billion years (correct)
What is the name of the layer of the atmosphere where weather occurs?
What is the name of the layer of the atmosphere where weather occurs?
Which layer of the Earth's atmosphere is primarily responsible for protecting the Earth from harmful ultraviolet rays?
Which layer of the Earth's atmosphere is primarily responsible for protecting the Earth from harmful ultraviolet rays?
Which of the following is NOT a characteristic of the atmosphere?
Which of the following is NOT a characteristic of the atmosphere?
In which layer of the Earth's atmosphere do many satellites orbit the Earth?
In which layer of the Earth's atmosphere do many satellites orbit the Earth?
Which sphere could not survive without receiving water from the hydrosphere, minerals from the lithosphere, and gases from the atmosphere?
Which sphere could not survive without receiving water from the hydrosphere, minerals from the lithosphere, and gases from the atmosphere?
At which boundary is the mesosphere separated from the thermosphere?
At which boundary is the mesosphere separated from the thermosphere?
The coldest layer of the Earth's atmosphere where water vapor often freezes to create ice clouds is known as:
The coldest layer of the Earth's atmosphere where water vapor often freezes to create ice clouds is known as:
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Study Notes
The Stratosphere
- Large concentration of ozone gas is found in the stratosphere
- Ozone gas absorbs a large percentage of radiant solar energy protecting the earth from harmful ultraviolet (UV) rays
The Mesosphere
- Coldest of the spheres, where water vapor often freezes to create clouds made of ice
- Mesosphere is separated from the thermosphere by the mesopause
The Thermosphere
- Topmost layer where many satellites circle the earth
- Temperatures rapidly increase and decrease due to thin air and proximity to the sun
The Biosphere
- Comprises all living organisms, including plants and animals
- Most living organisms found from 3 meters below ground to 30 meters above and in the 200 meters of the ocean and seas
- Biosphere relies on other spheres for survival, needing water from the hydrosphere, minerals from the lithosphere, and gases from the atmosphere
The Hydrosphere
- Refers to all forms of water in the Earth's environment
- Forms of water include oceans, lakes, rivers, snow, glaciers, water underneath the earth's surface, and water vapor in the atmosphere
- Hydrosphere is always in motion, with water flowing in rivers, streams, and the ocean
- Essential for plant and animal survival, covering approximately 70% of the earth's surface
The Lithosphere
- Evolved about 4.6 billion years ago
- Refers to the solid, rocky crust covering the entire planet
The Atmosphere
- Air surrounding the earth, always in motion and constantly changing
- Comprises about 14 different gases
- Responsible for weather, which occurs in the lower atmosphere (troposphere)
- Bottom layer of the atmosphere is the troposphere, where weather happens, and gets colder with altitude
- Separated from the next layer by the tropopause
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