section 28.4 Flashcards
1
Q
when did the world reach its current pattern
A
about 3,000 years ago
2
Q
what human activities cause a change in earth atmosphere
A
energy consumption, deforestation, industrial, and agriculture practice.
3
Q
a period when a large sheet of ice covered much of earths surface called
A
the ice age
4
Q
what causes the earth to have seasons
A
the hemisphere how it is tilted so the closer to the sun is summer and farther is winter
5
Q
what is deforestation
A
clearing a large area of forest land
6
Q
the increase in temperature of earths near surface and ocean called
A
global warming
7
Q
what is El Niño
A
the warming of the pacific ocean off the coast of western south america the occurs every 3 to 10 years
8
Q
what is La Niña
A
the cooling of the pacific ocean
