What is the official currency of canada?

Which of the following terms describes the layers of air surrounding the earth ?

All of the following occurred due to the invention of the railroad except

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.