1. How can scientists tell what CO2 levels were like in the past? 2. How many years of record are preserved in the Antarctic ice core?

3. What is the hottest year on record?

4. What happens when the oceans get warmer?

I give Brainliest!

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?

In which reaction is precipitation occurring?

I'm learning about the periodic tables and what each subject's configuration is. for example, hydrogen is 1s^1, but i don't understand how you get that. can someone me understand how to figure out how to figure this out? sorry if the question makes no sense, but it would really a lot if you could me understand! you so much if you can!