How do you calculate annual layers of snow from the past? 1. Count ice layers

2. Count tree rings

3. Count snow piles

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

In which environment would primary succession occur? a forest with a few remaining trees after a recent wildfire an area of exposed rock after a glacier melts away beach that is exposed to the air at low tide an abandoned baseball field in a small town

Aradio signal from a gps satellite take only about 0.067 seconds to reach a gps reciever. if the speed of light is about 300,000km/s, then approximately how far away is the reciever from from the satellite?