The discovery of what resource near Butte, Montana caused a huge boom in the region in the 1880s and 1890s?
A) Oil
B) Coal
C) Precious metals
D) Uranium
C
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The oldest rocks that have been dated by radioactivity are approximately
A. 4 billion years old. B. 2 million years old. C. 200 million years old. D. 10 billion years old.
The most common snowflake form is ____
A) graupel B) a dendrite C) rime D) a splinter
Solar scientists determine that the number of sunspots is increasing. Describe both the short-term and the long-term impact on solar radiation
What will be an ideal response?
The rain-shadow effect on the Isthmus is most pronounced
A. in the summer, on both sides of the coasts of the Isthmus. B. in the winter, on the Pacific side of the Isthmus. C. in the summer, on the Pacific side of the Isthmus. D. in the winter, on both sides of the coasts of the Isthmus.