Arctic sea ice has declined over the past few decades causing water levels to increase. This is an interaction of which two spheres?

Biosphere and geosphere
Cryosphere and hydrosphere
Geosphere and atmosphere
Hydrosphere and geosphere

This is an interaction of cryosphere and hydrosphere spheres.

Explanation:

The cryosphere is the sphere of the earth made up of ice sheets, icebergs, and glaciers, etc – which is mainly frozen water. When the ice melts, the melted water enters the oceans – which form part of the hydrosphere (another sphere of the earth), causing a rise in ocean surface levels.  This mainly happens when global temperatures increase causing the polar ice-sheets to recede due to melting ice. The reverse can also happen when global temperatures drop such as during ice ages.

step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.