5.3 gra

smog is a kind of atmospheric pollution caused mainly by exhaust and emissions from ------- and -------

automobiles and industries

removal of whole forests when harvesting timber , called ------- ----- has damaged forest ecosystems and endangered life

clear cutting

Two ways that acid rain affeects human systems is that it ---------- , -------- , and pollutes ------

corrodes stone , metal buildings and lakes

three ways that acid rain causes damage in the northeastern forests is that is -----, ------, and -----

corrodes stone, damages crops , and pollutes soil

the united states has taken many steps toward protecting the --------

enviroment

------- are one of the united states major natural resources

forests

people in the united states use more ----- than people in any other country

freshwater

another reason the united states is working to diversify energy sources and lessen its dependence on fossil fuels is in response to ------- and -------

global warming and greenhouse gasses

what are some of the effects of smog

harm to peoples lungs , eyes , and throughts , damages and kills plants

wetlands are necessary because , -------- ------ ------- ------ ----- ---- ----- , and --------------

hold valuable water supplies and fisheries , buffer coastal areas from floods and storms

renewable sources of energy such as -------, ---- , and ------- are growing in popularity

hydroelectric , solar , wind

two human activities that can cause water pollution are ------, --------- , especially in the region of the ------

industrial dumping , runnoff from agricultural chemicals , great lakes

wetlands are threatened or lost because of ------ and because they are -----

urban land use , polluted