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(ii) An area receives significantly less precipitation over a period of time than it typically does. Describe one negative environmental effect in the area as a result of the decrease in precipitation. - ANSWERS• drought leads to prolonged shortages in the water supply. (a) A period of precipitation is one of the short-term conditions in the atmosphere referred to as weather. (i) Identify the layer of Earth's atmosphere where the circulation and mixing of liquids and gases produce wea...

Natural greenhouse effect - ANSWERSThe layer of greenhouse gases in the atmosphere retains the sun's radiation to heat the Earth at 15oC. It sustains all life on Earth. The most common greenhouse gas is water vapour Cause of natural greenhouse effect - ANSWERS- Volcanic eruptions - Forest fires - Methane through decomposition and wetlands Enhanced greenhouse effect - ANSWERSRising global temperatures due to greenhouse gases being put into the atmosphere because of anthropogenic (huma...

What is the water cycle? - ANSWERScondensation-precipitation-evaporation. Why is groundwater important? - ANSWERSIt's the best source of freshwater What are the positive and negative effects of building a dam? - ANSWERSPositive- energy/flood protection Negative -displaces resident/sediment removal Compare point-source pollution and non-point pollution. Give an example of each. - ANSWERSPoint-source pollution-from a single source EX: gas leak; Non- point sources- comes from many d...

gross primary productivity - ANSWERStotal amount of organic material fixed by autotrophs net primary productivity - ANSWERSproductivity minus the energy used in respiration Abiotic factors that effect the rate of primary productivity - ANSWERSmoisture/water; sunlight; carbon dioxide Describe what pyramid of numbers show - ANSWERSthe total number of individual organisms at each trophic level in the food chain of an ecosystem Explain the shape of the pyramid of numbers - ANSWERSA tree ...

What type of farming do most people in developing nations practice? - ANSWERSsubsistence farming Identify 3 characteristics that make the US food and fiber system successful. - ANSWERSFertile soil, a favorable climate, access to advanced machinery List 3 of PA's major agricultural products. - ANSWERSMilk, poultry+eggs, mushrooms What is the green revolution? - ANSWERSmodern farming method that uses scientifically produced varieties, fertilizers, pesticides, water and technology to in...

1. Select the best answer. _____ is a structural component of hair, skin, and nails. - ANSWERSKeratin 2. Select the best answer. _____ is a process that is used by cells to absorb substances that pass the cell membrane. - ANSWERSEndocytosis 3. Select the best answer. Another name for the phylum Apicomplexa is _____. - ANSWERSSporozoa 4. Select the best answer. Membrane-bound organelles that expand and contract as a way to pump water out of a cell are called _____. - ANSWERScontracti...

Which of the following is the control group for this experiment? - ANSWERSSoil with no grass Which of the following is a dependent variable in the experiment? - ANSWERSPercent change in mass of the soil sample Which of the following describes the independent variable in this investigation? - ANSWERSSoil samples taken from different locations Which of the following describes the dependent variable in this investigation? - ANSWERSPercentage of each particle size in each soil sample A s...

water cycle - ANSWERSthe continuous circulation of water throughout our environment aquifers - ANSWERSlayers of porous underground rock where water can flow storages - ANSWERSwhere water can be found within the hydrologic cycle watershed - ANSWERSthe total land area that contributes water into a particular waterway Drainage Basin - ANSWERSlarge watersheds overland flow - ANSWERSanother way to say "surface runoff" topography - ANSWERSthe shape of a land surface that determ...

. What effect does the increase in greenhouse gases have on the atmosphere that contributes to global warming? - ANSWERSGreenhouse gases trap extra heat close to the surface of Earth. 2. Which statement is true about the relationship between Earth's average surface temperature and the amount of carbon dioxide in the atmosphere? - ANSWERSThe average surface temperature is increasing as the amount of carbon dioxide in the atmosphere increases. 3. If air pollution was reduced, what would h...

Ozone Layer - ANSWERSBunch of O3 molecules in the stratosphere. Acts as Earth's sunscreen since it blocks UV rays. Causes of UV Radiation - ANSWERSCauses include skin cancer, cataracts, weakened immune systems, plankton survival and plant growth. Chlorofluorocarbons (CFCs) - ANSWERSMain cause of depletion of ozone. Occurs through a 2-5 year process where they break down O3 into O2. Includes aerosols, insulating foams, refrigerants, solvents. Antartica - ANSWERSWhere the depletion of ...