cycles (carbon, water, nitrogen)
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what are the three main elements that must move through an ecosystem
water, carbon, nitrogen
what percentage of cells is water
70-90%
what is evaporation
water lost in air from the ground, rivers, lakes, oceans, etc.
what is condensation
water vapour condenses into clouds
what is precipitation
water returns to earth as rain, snow sleet, etc.
what is surface runoff
water moves through the ground as groundwater and over the ground as lake, rivers, etc.
what is transpiration
evaporation of water from leaves
what are the steps in a water cycle (in order)
evaporation condensation precipitation surface runoff transpiration
3 examples of precipitation
rain, snow, sleet or hail.
the human body is composed of how much water
70%
water participates in many important biochemical reaction, including
• photosynthesis • digestion • cellular respiration
another name for water cycle
hydrologic cycle
what does the amount of precipitation received by an area determine
• what plants will grow • the type of animals that will inhabit a region
what is the saturated zone of rock and soil called
aquifer
what are examples of runoffs
-rivers - melting snowfield - glaciers
what cause water evaporation from the ocean
solar radiation
what does water remain in the atmosphere as
clouds, ice crystals, water vapour.
how does carbon enter the biotic world
the action of autotrophs ( plants and algae throughout the process of photosynthesis
how does carbon return to the atmosphere and water
• respiration (as C02) • burning • decay (decomposing plants and animals)
what nutrients are used by organism in large quantities
carbon, hydrogen, oxygen, nitrogen and phosphorus
which nutrients are used by organisms in tracs amounts
iodine, iron, zinc and some others
what is biogeochemical cycle
macronutrients and micronutrients are recycled back and forth between living things and nonliving components of an ecosystem.
what is earths major reservoir of carbon
the atmosphere
which organic compounds do plants fix carbon into
glucose, starch, cellulose and other carbohydrates