You are given a bone sample and, when you measure the amount of carbon and nitrogen in the sample you find that the sample contains 625 mg of C-14 (parent atom) and 1875 mg of N-14 (daughter atom). If Carbon-14 has a half-life of 5730 years, how old is the sample? “ Physical geology “

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

not only is it colder, it also becomes darker, less salty, and more dense.

glacial erosion, the picking up and movement of earth beneath a glacier, is also referred to as plucking. erosion and transportation of individual pieces of bedrock, especially large "joint block occur as a result of this glacial erosion. plucking is type of erosion in which rocks become frozen into the bottom and sides of the glacier.as the glacier moves downhill it 'plucks' the rocks frozen into the glacier from the ground.