Why are underwater areas that have reefs, volcanic activity, or glacial deposits so productive for fishing?

Amountain created from tectonic activity would be considered which type of landform ? a) primary landform b) secondary landform

Sarah is making a scale drawing of a painting that is 48inches wide by 120 inches high her paper is 12 inches wide and 24 inches tall she decides to use a scale 1 inches equals 4 inches is this a reasonable scale

The ozone hole is at its biggest each year in the ? hemisphere in the ? season.