Rain causing streams to flood would be an example of interaction between which to spheres A. Hydrosphere and Geosphere B. Hydrosphere and Atmosphere C. Atmosphere and Cryosphere D. Biosphere and Hydrosphere
Here's a guess at ... A Rain is water, water is implied by Hydro. Streams flow through the ground. The ground is geological/geographical. This implies Geo. I'd go for Hydrosphere and Geosphere ... http://perendis.webs.com
I'm no "sphere person" but my guess is that the person who is a "sphere person2 has sort of this breakdown in mind ... spheres Hydrosphere - water ? seas and clouds and rain and hail snow and ... etc ? Geosphere - land ? Atmosphere - air Cryosphere - cold ? (cryogenics implies very cold, so maybe the sphere is the polar regions of the earth, good old ice and land mixed together, along with WARM WOOLY HATS ! Biosphere - living things ?
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