7)
a) what primary processes account for the difference between surface and deep water concentration of n (as nitrate) and p (as phosphate)?
b) what process leads to the the large surface water values of pb (lead) seen in the ocean?

Suggest two reasons why irrigation is important for human development of the desert (4 marks)

What factors influenced brazil's current and future economic strength?

State a hypothesis with a numerical estimate of the calories contained within a peanut based on the nutritional information on the package label combined with what you have learned in this lesson about fuel efficiency and calorimeters.