A.the lowest temperature there is – 40℃ |
B.the depth of ice is 3,000 meters |
C.the ice has existed for 15,000 years |
D.snowfalls are kept in certain patterns |
A.separating carbon dioxide from the air |
B.examining the growth rings of trees |
C.comparing temperatures in different areas |
D.studying the ice and air caught in each layer |
A.there is something wrong with the data |
B.greenhouse effect is always a bad thing |
C.a new ice age will not come in the near future |
D.greenhouse gas will get thick in the future |
A.Research over the Antarctic area. |
B.Warm period to last about 15, 000 years. |
C.Report on the eight ice ages in the past. |
D.Hollywood movies and the global climate. |