What evidence suggests that Mars had an active hydrologic cycle in the past?
What will be an ideal response?
Mars has all kinds of stream-like features carved into its surface, which most likely are the result of the work of running water.
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Shield volcanoes, like Mauna Loa, have what kind of slopes?
A) Broad, gentle B) Nearly level C) Extremely steep
The lesson learned by Arliss and Todd Nielsen on their Iowa farm is that ________
A) erosion and soil nutrient losses are reduced with no-till agriculture B) global climate change is producing desertification in Iowa C) removing all weeds is essential for highest crop yields D) crop yields are much lower using polyculture E) plowing in the winter increases soil fertility and crop yield
Of the 40 worst disasters between 1970 and 2013, the most frequent mega-killers were hurricanes and earthquakes.
Answer the following statement true (T) or false (F)
A stream cannot erode below
A. its channel. B. sea level. C. its headwaters. D. its tributaries. E. its bedrock.