AIM: SWBAT Describe the hydrological cycle and cite a good example of how humans have

disrupted itPlease Do Now: 1) Why are there more sardines

than sharks in an ecosystem?2) Why are the hydrological cycle, and other

biogeochemical cycles, examples of closed systems?

AgendaDo NowHydrological Cycle Notes“Quiz”From Venn Diagrams to Cladograms

Remember: Steps of the Hydrological CycleEvaporation

TransportCondensationPrecipitation

RunoffInfiltrationStorage

Hydrological CycleThere is a

finite amount of water on the planet

How do living things influence the hydrological cycle?EvaporationWhen the water molecules

absorb the sun’s energy, they go from a liquid state to a gaseous state

BIOLOGICAL INPUT: transpiration, the process by which plants take water up from the soil and it evaporates through its leaves, drastically increases the amount of evaporation happening on land

How do living things influence the hydrological cycle?CondensationWhen water vapor reaches

a high enough part of the atmosphere, it cools down to a point where it is tiny drops of liquid again

BIOLOGICAL INPUT: often water droplets will not condense unless there is a little grain of pollen or a microbe floating in the air for it to start forming around

PrecipitationWhen the water

droplets in the clouds have gotten too big, they fall to earth as rain or snow

What happens to water on the ground?A number of things happens to recently

precipitated water:Gets tied up in a glacier or snow capWill run off into a lake or an oceanWill enter the soil, become part of the ground

water, called infiltrationOr it can enter the biosphere and become

part of the tissue of living organisms

What are Aquifers?Aquifers are underground

reservoirs of waterThey are the result of

infiltrationThey take an extremely

long time to fill upWe are pumping the

water out of them way faster than the hydrological cycle can replenish it

Ex: ogallala aquifer, central valley of california

Subsistence from aquifer depletion

Why Does the Hydrological Cycle Matter?The two abiotic factors that are most

important in determining what can live in an environment are temperature and how much precipitation the area gets

“Quiz” timeWhat you are going to do for your quiz grade

this week is use the dichotomous key I have prepared and determine the identity of an unknown leaf species

It will be good practice for next week outdoors

Should be an easy 100%All you need to do is write down all the steps

you took through the key to arrive at your answerEx: question 1: no, question 2: no, question 4:

yes, chart 8: northern red oak