Which are human systems? the amazon rain forest the appalachian trail the george washington bridge the himalayas the hoover dam the north american free trade agreement the san andreas fault the suez canal

Where would you be most likely to find a freshet?

Why is the huronian supergroup rock formation particularly interesting to scientists? because it looks like a cross-section of a giant, stone encyclopedia because it formed during the period when oxygen began to accumulate in the atmosphere because it contains unusually large amounts of oxygen and sulfur because it dramatically altered the planet's development when it first formed

Soil color only reflects the amount of organic matter present in soil.