Which of the following is the smallest grain size category for clastic particles?
a. sand
b. gravel
c. silt
d. clay
d
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The total ecological footprint for humanity is expected to be
a. twice the planet's ecological capacity by the year 2015 b. 30% higher than the planet's ecological capacity by the year 2035 c. 60% higher than the planet's ecological capacity by the year 2035 d. 30% higher than the planet's ecological capacity by the year 2015 e. twice the planet's ecological capacity by the year 2035
Long scratches formed when a glacier moves over a land surface:a
tillites d. tuffs b. moraines e. point bars c. striations
How fast do comets travel?
a. about 2 to 3 km per minute b. about 60 km per minute c. about 2 to 3 km per second d. about 60 km per second e. about 500 km per second
How does the U.S. Geological Survey decide to issue an earthquake warning?
What will be an ideal response?