The warm period on Earth about 7,000 years ago is known as the _______________
Fill in the blank(s) with correct word
altithermal, Altithermal
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Although mostly seen by pilots, the glory's name comes from its appearance when viewed by an observer located on the ground
Indicate whether the statement is true or false
The rugged terrain, low population densities, dry climate, and high transportation costs of the Intermontane meant that which sector of the economy never successfully developed?
A) A primary sector B) A secondary sector C) A tertiary sector D) A quaternary sector
The most common mineral in Earth's crust is ________ and the second most common mineral is ________
A) quartz; feldspar B) feldspar; quartz C) silicate; carbonate D) olivine; feldspar
The EPA is charged with cleaning up brownfields, which are ________
A) urban areas contaminated by acid drainage from mining B) desert regions used for unsafe nuclear waste disposal C) agricultural lands polluted by acid and heavy metals D) coastal seagrass beds damaged by industrial dumping E) lands whose reuse or development is complicated by the presence of hazardous materials