Card Set Information
what is population density?
the measure of the number of people in a given area
explain landfills. why do tey have liners?
a site for disposal of waste materials
liners:keep toxic chemicals from seeping into groundwater
explain renewable natural resources give an ex.
a resource that can use over and over again.
explain nonrenewable natural resource give an ex.
resources that connot be replaced or replnished fast enough.
a substance that makes air,water,and land harmful to life
what are the 2 main types of pollution we talked about? give details for each type
air and water pollution
air-caused from vehicles,power plants, and factories
water-caused by chemical run-off,farm fields,oil spills, and erosion.
explain exstinction. how many species go exstinct each year?
when a specie is no longer living
aboout 100 each year
wha consequences would come from from clear cutting a forest?
it would take away available food,space, and shelter
explain biodiversity. why is it healthy for an ecosystem? how can we preserve biodiversity?
the number and variety of life forms with in an ecosystem
the greater the biodiversity the more easily an ecosystem can recover
cities can protect natural habitats and conserve resources
the process of saving or protecting and conserve resources
explain organic farms
farms that use natural pest controls and fertilizers
explain fuel cells
they can power cars without gasoline
list and explain alternative energy sources
geothermal energy- uses heat from earth
wind energy- uses energy from wind to turn tubines
hydropower/electric energy-uses energy from flowing water
tidal energy- uses energy from tides
nuclear energy-uses energy from splitting up atoms
explain sustainable. list ex. of sastainable practices
sustsainable refers to the ways that humans can use up resources without using them up.humans who live sustainbly reduce the impact they have on the enviroment
bike or walk
use energy efficient appliances
add insulation turn heat down in winter opposite in summer
organic farming using alternative energy sources