Ais a barrier built across a river that may redirect its flow to another channel or store floodwater so they can be released easily.

What are two australian geographical features that hindered early exploration? western plateau gulf of carpentaria great barrier reef great dividing range

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.

What man-made lake was created by the building of the hoover dam?