Nitrogen cycle

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Water Cycle: The water cycle describes the existence and movement of water on, in, and above the Earth. Earth's water is always in movement and is always changing states, from liquid to vapor to ice and back again. The water cycle has been working for billions of years and all life on Earth depends on it continuing to work; the Earth would be a pretty stale place without it. The water cycle has no starting point. But once the water is evaporated from its source (seas, oceans, ponds, lakes, etc.), it is taken to the atmosphere by vapor current. When the vapor is in the atmosphere the water condenses into the cloud and it falls back to the earth in the form of cloud particles. This is known as precipitation. Nitrogen Cycle:

Principles of Ecology

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Principles of Ecology Organisms and Their Environment What is Ecology? Ecology: the study of interactions that take place between organisms and their environment The Biosphere Biosphere: the part of Earth that supports life The biosphere includes the top portion of Earth?s crust, all the waters that cover Earth?s surface, and the atmosphere that surrounds Earth. The biosphere is made up of different environments that are home to different kinds of organisms. Ecosystem: all the living organisms living in an area and the nonliving features of their environment Biotic factors: living organisms in an ecosystem (ex. bison, grass, birds, insects) Abiotic factors: nonliving features of an ecosystem (ex. water, temperature, sunlight, soil, air) Levels of Organization

Bio112 April 29th

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Bio 112

Bio 112 April 29th, 2013 More on Ecosystems Food webs -Is a branching food chain with complex trophic interactions -Including decomposes (detritevors) Energy Flow through Ecosystems -from one trophic level to the next. Primary production - are photoautotrophs, capturing energy from the sun. Energy flows from these guys through all other levels. Of course some energy will be lost at each level. -light energy converted to chemical energy by autorophs during a given time period. -Gross primary production is the total primary production. -Net primary production is GPP minus energy used by producers (respiration)-only this is available to consumers. NPP is more important then GPP. Secondary production

APES Midterm

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earth

Planetary atmospheres

Part A Directions: Each set of lettered choices below refers to the numbered questions or statements immediately following it. Select the one lettered choice that best answers each questions or best fits each statement and then fill in the corresponding oval on the answer sheet. A choice may be used one, more than once, or not at all in each set. ? Questions 1 and 2 refer to the following concepts relating to systems? Linear growth Feedback Loop Exponential growth Equilibrium Growth rate in which the amount doubles in a fixed unit of time. Change that tends to stabilize a system Questions 3-5 refer to the following biogeochemical cycles Carbon cycle Nitrogen cycle Hydrologic cycle Geological cycle Biogeochemical cycle

APES CHAPTER 4

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Soil

Exam 4 review sheet Chapter 3 Hydro cycle Solar energy heats Earth, and causes evaporation Evaporated water condenses into clouds Water returns to Earth as precipitation Precipitation falling on land is taken up by plants, runs off along the land surface, or percolates into the soil and enters the groundwater Carbon cycle Carbon is the most important element in living organisms makes up 20 percent of total body weight. Produces convert CO2 into sugars Sugars are converted back into CO2 Some carbon can be buried Human extraction of fossil fuels brings carbon to Earth?s surface, where it can be combusted C02 in the atmosphere and CO2 dissolved in water are constantly exchanged Combustion converts fossil fuels and plant material into CO2 Nitrogen cycle

APES CHAPTER 4

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