Which of the following represent human systems?
hoover dam
genetic engineering
volcanic eruptions
the panama canal
plate tectonics

What factors influenced brazil's current and future economic strength?

Some gamma ray bursts are hypothesized to come from mergers of neutron stars or black holes. if this hypothesis is correct, what else should we in principle be able to detect from such mergers? a. gravitiational waves b. x-ray bursts c. significant disruption of gas thousands of light-years away in the surrounding galaxy d. an "afterglow" of bright visible light, lasting for weeks

At first after world war ii, japan’s factories produced goods that were used by the japanese government poorly made toys and novelties high-quality cameras inexpensive motorcycles