I'm NOT 100% sure about this answer but I think it's the Lines of Longitude
Answer:
Distinction from Tundra Climate
For example, tundra climates usually have a month in which the average temperature rises beyond the freezing point, while this does not occur in polar climates. The hotter month allows the ice in tundra climates to melt, which enable plants and animals to survive.
Answer: About 1/3 of the co2 produced by humans during the past century has been absorbed by the ocean.
Answer:
1 - a
2 - d
3 - c
4 - b
5 - e
Explanation:
1. largest Northeastern state - new york
2. smallest Northeastern state - Rhode island
3. most densely populated state - Maine
4 .state with highest percentage of land being farmed - Connecticut
5. state using ten percent of land for farming - Massachusetts
following are the key of the matching
1 - a
2 - d
3 - c
4 - b
5 - e