Describe how weathering, erosion, and deposition act together to wear down and build up earths surface

For the following, determine the type of reaction and then give products.

If you chip a tooth, most likely you will go to the dentist to have the missing material filled in. currently the material used to fill in teeth is a polymer that is flexible when put in, yet is hardened to the strength of a tooth after irradiation with blue light at a wavelength of 461 nm. what is the energy in joules for a photon of light at this wavelength?

True or false exosphere is the least dense