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Earth’s Spheres
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Is there life on this planet?
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Life on Planet Earth What special features and conditions does Earth have that make life possible? Some people say that Earth itself is a living organism. Does that seem possible to you?
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Earth’s 4 Spheres
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The Atmosphere What is it? What is it made of? What does it hold in?
A layer of gases surrounding the earth. What is it made of? Nitrogen, Oxygen, Carbon dioxide, Water vapour, other gases What does it hold in? Thermal energy What does it block out? Ultraviolet light After students complete the table above, ask them which features of the atmosphere help make life possible. Have volunteers supply answers. Point out that: • all living things need water, carbon dioxide, and oxygen • thermal energy held in keeps temperatures moderate for life • UV light blocked helps protect life
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Lithosphere Earth’s Solid Outer Layer
Makes mountains, ocean floors, and earth’s solid landscape 50 – 150 km thick
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All of Earth’s water, in solid, liquid, and gas form.
Hydrosphere All of Earth’s water, in solid, liquid, and gas form. 97% contained in oceans
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Biosphere The zone around the earth where life can exists.
Locations where life can exist within the atmosphere, lithosphere, and hydrosphere.
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Ecology Ecology is the study of how organisms interact with one another and with their environment.
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Ecosystems An area in which living organisms interact with other living components (biotic) and non-living components (abiotic) All the living organisms that share a region and interact with each other and their non-living environment.
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Abiotic Factors The non-living components of an ecosystem.
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Abiotic Factors Sunlight - provides energy for all living things.
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Water - all life processes depend on water.
Abiotic Factors Water - all life processes depend on water.
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Abiotic Factors Soil - determines the types of plants that can live in a certain location.
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Abiotic Factors Temperature - determines the organisms that can live there.
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Oxygen - most living things require it to live.
Abiotic Factors Oxygen - most living things require it to live.
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Biotic Factors The living or once living parts of an ecosystem. Ex: plants and animals.
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