How many degrees of longitude wide is africa

How are farmers that use no plow farming methods able to improve air quality for the people around the fram

The kind of wood most often used in contemporary furniture is

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.