Which of the following is correct?
a. north africa relies on tourism
b. north africa has struggled with civil war.
c. north africa is facing desertification.
d. all of the above

As water is cooled from 4 c to 0 c its density

Look at the diagram showing the different wavelengths in sunlight. which statement describes electromagnetic waves with wavelengths greater than 700 nanometers? they take the form of heat. they can cause skin cancer and sunburn. they are some of the shortest waves. they can be seen by human eyes as visible light.

What are mountains that divide european russia from asian russia?