Afairly dry area between the sahara desert and the wetter regions to the south is the
a. savanna
b. sahel
c. grasslands
d. congo

Who developed the theory of plate tectonics?

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.

After railroads, the next revolution of transportation came with the development of (a) automobile (b) telegraph (c) steam engine