Answer to Question 1
The immature soils with weakly developed horizons occur where the landscape is unstable and erosion removes any regolith before it chemically weathers into soil. These soils are most obvious in mountainous areas where erosion rates are high and along large-river floodplains where deposition rates are high. Immature soils also occur on areas that continually get fresh deposits of sediment or volcanic material (lava or ash).
Answer to Question 2
The calcium is delivered by the wind as dust particles and in rainfall.
Survivorship curve for the North American beaver.
Resource partitioning among five species of warblers feeding in North American spruce trees.
California sea lions are common prey for mammal-eating killer whales on the west coast of North Amer
Human infants are like all other placental mammals, except they are born at a less developed state.
The Graying of America: Americans Age 65 and Older
Brain Areas Involved in Memory