Iron , lead , copper and gold is

Blank is a naturally occurring gas that's found in most soils and rocks and can cause lung cancer

17. the soil erosion pictured here is the result of what? a. harvesting renewable resources at a rate greater than the sustainable yield b. a mudslide caused by excessive rains c. harvesting renewable resources at a rate lower than the sustainable yield d. the transition between geologic eras and eons

Which region was the hearth for the largest number of agricultural animals such as pigs sheep and cows