Lecture 3 - continents by bodies of water, mountain ranges,...

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Lecture #3: Earth’s spheres Lithosphere- Hard parts of Earth. It largely consists of rocks and minerals. Divided into three parts: crust, mantle, core. Iron, oxygen, silicon. Most iron is found in the core. Cryosphere- Water in solid form (snow/ice) Atmosphere- Earth’s envelope of gas. Mainly nitrogen and oxygen. Allows us to breath. Responsible for weather and climate. Ozone protects from harmful cosmic and solar radiation. Hydrosphere- Liquid part of Earth. Ocean, lakes, rivers, groundwater, seas. Biosphere- All living things. Organic/Biotic- Plants, animals, viruses (biosphere). Inorganic/Abiotic- Land, water, air (hydrosphere, cryosphere, lithosphere, atmosphere). Percentage of Earth’s surface covered by water- About 3/4 Continent- Seven continents. Landmasses situated above sea level. Seperated from other
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Unformatted text preview: continents by bodies of water, mountain ranges, and isthmuses. Ocean- Artic, Pacific, Atlantic, Indian, Southern Ocean. Pacific is largest. All salty. Current- Circulates due to water density, water temperature, and wind. Crust- Uppermost part. Continental and oceanic. Oceanic crusts exists under the oceans waters. Continental crust is dry land. Mantle- Upper (lithospheric) and lower mantle (asthenosphere). Uppermost part of the upper mantle plus the crust (oceanic and continental) is called the lithosphere. Lithosphere is the surface of the Earth that cracks and moves during Earthquakes. Core- Mostly iron. Consists of solid inner core and liquid outer core. Outer core takes up more volume than inner core....
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