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Questions and Answers
Which layer of the atmosphere contains a high concentration of ozone?
What percentage of the Earth's atmosphere is made up of nitrogen?
Which landform contains deep valleys within the mountain ranges?
Which layer of the atmosphere is closest to the Earth's surface?
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What natural events are caused by the constant motion of air around the planet?
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What gas in the Earth's atmosphere helps maintain a suitable temperature necessary for life?
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What is the role of phosphorus in living organisms?
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Where does the phosphorus cycle start?
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How do plants and animals obtain phosphorus in the phosphorus cycle?
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What happens when plants and animals die in the phosphorus cycle?
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Which biogeochemical process involves the movement of phosphorus through lithosphere, hydrosphere, and biosphere?
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What is one of the abundant elements on Earth according to the text?
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What percentage of fresh water is found in lakes, rivers, and other available surface forms?
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In the hydrologic cycle, does the total number of water particles change as water changes its state?
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Which process involves the conversion of water vapor into liquid water droplets?
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What is one of the important materials for green plants to perform photosynthesis?
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What happens to the carbon stored in animals once they die?
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Which process returns carbon to the environment through cellular respiration by animals?
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What is the main source of carbon released back to the atmosphere in industries like factories?
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How is nitrogen initially fixed in the atmosphere for use by plants?
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What compound is formed when the nitrogen gas in the atmosphere is converted by bacteria in plant roots?
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What process involves converting ammonia into nitrites and nitrates in the nitrogen cycle?
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Which step of the carbon cycle involves animals consuming plants and eventually decomposing, releasing carbon back to the atmosphere?
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What is the final step of the nitrogen cycle that returns nitrogen into the atmosphere?
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What is the color of sulfur found in all kinds of proteins?
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How is sulfur released into the atmosphere?
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What happens to sulfur when animals die and decompose?
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Which process converts sulphates into organic forms in the sulfur cycle?
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What are some natural sources of sulfur release into the atmosphere?
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Study Notes
Carbon Cycle
- Carbon is released into the atmosphere during combustion in industries that use fossil fuels
- Plants absorb carbon dioxide from the atmosphere for photosynthesis
- Carbon is stored in plants and animals, and eventually released back into the atmosphere through decomposition
- Fossil fuels, formed from carbon-rich organisms, release carbon dioxide when burned, contributing to the carbon cycle
Nitrogen Cycle
- Nitrogen is an essential element of life, converting between various forms as it circulates through the atmosphere, terrestrial, and marine ecosystems
- Nitrogen-fixing bacteria convert nitrogen gas into usable ammonia, made available to plants and soil
- Ammonia is converted into nitrites and nitrates, and eventually reduced back into nitrogen gas through denitrification
- Nitrogen cycle includes nitrogen fixation, nitrification, assimilation, ammonification, and denitrification
Atmosphere
- The atmosphere is the air surrounding the Earth, comprising a mixture of gases: 78% nitrogen, 21% oxygen, and 1% other gases
- The atmosphere helps regulate temperature, stops harmful ultraviolet rays, and maintains life-giving conditions
- The atmosphere is divided into five layers: troposphere, stratosphere, mesosphere, thermosphere, and exosphere
Hydrologic Cycle
- Water changes its state from one phase to another, but the total number of water particles remains the same
- Hydrologic cycle involves processes such as evaporation, condensation, deposition, and precipitation
- Water is in constant motion, driving natural events like local breeze, winds, tornadoes, and tropical cyclones
Phosphorus Cycle
- Phosphorus is an essential element in living organisms, playing a significant role in DNA, RNA, ATP, and bone structure
- Phosphorus cycle is a slow biogeochemical process that moves phosphorus through the lithosphere, hydrosphere, and biosphere
- Phosphorus is released from rocks through weathering, absorbed by organic matter, and used for biological processes
- Phosphorus is recycled back into the soil and water bodies through decomposition and erosion
Sulfur Cycle
- Sulfur is an abundant element on Earth, present in proteins and rocks
- Sulfur cycle is a biogeochemical cycle that moves through rocks, water bodies, and living systems
- Sulfur is released into the atmosphere through weathering, volcanic activities, and decomposition of organic molecules
- Sulfur is converted into sulfates, taken up by microorganisms and plants, and eventually recycled back into the soil and atmosphere
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Description
Test your knowledge on the carbon cycle, which involves the movement of carbon between the atmosphere, plants, animals, and fossil fuels. Learn how carbon is absorbed, released, and recycled in various stages of the cycle.
