I believe that answer is a because it has opposite reactions.
Answer:
The largest freshwater lake group is Superior with 31700 sq mi
Answer:
polar region
High latitudes are dominated by floating sea ice covering much of the Arctic ocean in the north, and by the Antarctic ice sheet on the continent of Antarctica in the South.
Answer:
A triangulation station, also known as a triangulation pillar, trigonometrical station, trigonometrical point, trig station, trig beacon, or trig point, and sometimes informally as a trig, is a fixed surveying station, used in geodetic surveying and other surveying projects in its vicinity.
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Answer:
Sulfur: gunpowder and medicines
copper: coins and jewelry; and in coins
diamond: drill bits and saws
Explanation: