Desertification is a. the natural process of desert formation caused by global climate changes b. caused by blowing sand from existing deserts that buries surrounding arid lands and converts them to desert c. caused by the rain shadows cast by mountains d. accelerated by intensive agricultural activity in arid and semiarid lands

15 points need quick 1. looking at your graph and the geologic time scale during what period did this rock form? what is the age span of the rock, in millions of years? 2. this rock sample is limestone and shale. with what you know about rock formation, what type of environment did these organisms live in? 3. if some of these fossil samples were found in a rock also containing leaf fossils, could you use radiocarbon dating to determine the age of this rock? explain.