Problem 1
a) explain why two rocks originating from the same magma can be different in appearance and properties.
b) on what basis are sedimentary rocks usually named? give at least three examples.
c) indicate two processes that may lead to the formation of chemical sedimentary rocks.
d) explain the two main processes leading to the formation of soils

Which of the following statements is true? a. there is not enough food produced in the world to feed everyone. b. the biggest cause of hunger and malnutrition is the cost of getting food to people who need it most. c. most countries have enough arable land and resources to feed their own population and export a surplus d. malnourishment is only seen in a few countries with very limited food supplies.

What is the reason for the “scramble for africa”?

In the diagram below, ab and bc are tangent to o. what is the measure of