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28.4
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
卡片总数: 6 张•内容版本: v3•公开卡包•更新时间: 8/1/2026
卡片预览 (6 张)
#1
正面 (问题)
when did the world reach its current pattern
背面 (解答)
about 3,000 years ago
#2
正面 (问题)
what human activities cuases change in earth atmosphere
背面 (解答)
energy consumption deforestaition industrial argriculture practice
#3
正面 (问题)
a period when a large sheet of ice coverd much of earth surface called
背面 (解答)
the ice age
#4
正面 (问题)
what causes the earth to have seasons
背面 (解答)
the hemisphere how it is titled so the closer to the sun is summer and farther is winter
#5
正面 (问题)
what is deforestation
背面 (解答)
clearing a large area of forest land
#6
正面 (问题)
what is el nino
背面 (解答)
the warming of the pacific ocean off the caost of western south america