Ultraviolet radiation is dangerous because it has a high enough energy to damage skin cells. UV radiation is called ultraviolet because it has a frequency which is higher than violet radiation (purple light). Therefore, it has a wavelength which is ___________ than violet radiation.
A) bigger
B) smaller
C) the same size
D) the square root of
8)
Erosion of the beach is normally a slow process. What is one factor involved in this erosion?
A) animal motion
B) changing tides
C) emptying rivers
D) building coral reefs
9)
