Most economically valuable metals are processed from

A) ionic compounds.
B) silicate ores.
C) oxide and silicate ores.
D) sulfide and oxide ores.


Answer: D

Environmental & Atmospheric Sciences

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Is it possible to see D from B?

The question is based on this contour line map with elevations shown in feet.
• North is to the top of the map.
• Streams are shown with dashed lines.
• A graphic scale for measuring horizontal distances is shown below the map.
• Estimate elevations between contour lines to the nearest half-contour interval; assume that the top of a
hill is one-half-contour interval higher than the highest contour line shown.


What will be an ideal response?

Environmental & Atmospheric Sciences

The only zone of the ocean with sufficient light for photosynthesis is the ________.

A. aphotic zone B. disphotic zone C. euphotic zone D. None of these choices is correct. E. All of these choices are correct.

Environmental & Atmospheric Sciences

Trace the changing temperature of the atmosphere from Earth's surface to the top of the thermosphere

What will be an ideal response?

Environmental & Atmospheric Sciences

An agricultural drought is usually defined by:

A) a deficit of soil moisture. B) reduction in surface and subsurface water supplies. C) rainfall totals that are below normal values. D) three weeks or more without measurable precipitation.

Environmental & Atmospheric Sciences