Why do light-fur mice survive LESS often on dark rocks, compared to dark-fur mice?

for a creature with a lighter fur color it is next to impossible to blend into darker colored environments compared to darker fur colored creatures

Light-fur mice survive less often on dark rocks because they are easily seen by predators while dark-fur mice are harder to see.

The same situation applies to dark-fur mice on light rocks.

volcanoes (an event in the geosphere) release a large amount of particulate matter into the atmosphere. these particles serve as nuclei for the formation of water droplets (hydrosphere). rainfall (hydrosphere) often increases following an eruption, stimulating plant growth (biosphere).