Which of the following is the smallest grain size category for clastic particles?

a. sand
b. gravel
c. silt
d. clay


d

Environmental & Atmospheric Sciences

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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

Environmental & Atmospheric Sciences

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

Environmental & Atmospheric Sciences

How does the U.S. Geological Survey decide to issue an earthquake warning?

What will be an ideal response?

Environmental & Atmospheric Sciences

Long scratches formed when a glacier moves over a land surface:a

tillites d. tuffs b. moraines e. point bars c. striations

Environmental & Atmospheric Sciences