What country in east asia is currently threatened by the expansion of its desert in its western regions?
a) china
b) japan
c) taiwan
d) north korea

After examining the evidence at a site, a geologist thinks that a river could have once flowed through the area. what evidence would support this conclusion? a) the site is a vast, open grassland. b) a high level of tectonic activity is present. c) this location contains igneous rocks everywhere. d) many sedimentary rocks with fossils have been found.