6. Organisms that use photosynthesis produced the
today's atmosphere.

What is the approximate circumference of the circle shown below? 12.2 cm

Name the two rivers that run through the fertile crescent. how were the rivers both positive and negative to societies of the fertile crescent?

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.