How many half lives will have passed if 7500 atoms of carbon-14 remain? How old would the rock be?

Why are all maps distorted? when reading a map, why is it important to check the legend? what is the difference between longitude and latitude? identify the meridian at 0° longitude and the parallel at 0° latitude.

You have been tasked with sorting the rock samples shown into three categories, with two rocks in each category. what attribute would you use to sort these rocks? which rocks would be in each category? rocks: obsidian, coquina limestone, granite, soapstone,pumice, and gneiss.

Sink holes may eventually for to join a. wide valleys b. zone of aeration c. dripstones d. aquifer