The fossil in the picture is a trilobite that lived about 500 mya. so, the age of the rock in the picture is million years old. a) at least 500 b) at most 500 c) exactly 500

Click the item in the left column. use the plus sign to move it up or the minus sign to move it down until it matches the correct entry in the right column. lock your answer in place by clicking the square beside the item. (a checkmark means it is locked.) amazon basin a atacama desert b andes mountains c lake titicaca d peru e patagonia f brazil g chile h suriname

What's erosion? a. the breakdown of rock into smaller pieces b. the removal of weathered products from rock c. a change in rock resulting from exposure to water d. a chemical change in rock that weakens it

Political boundaries are determined by the political party in control at the time. true or false