Which of the following characteristics describes silicate minerals?
-Silicate minerals contain only silicon.
-Silicate minerals make up 8 percent of Earth's crust.
-Silicate minerals contain calcite and dolomite.
-Silicate minerals contain halite and gypsum.
-Silicate minerals contain silicon and oxygen.
-Silicate minerals contain silicon and oxygen.
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The Observable Universe: How does the age of the universe (estimated at 14 billion years) introduce the concept of the "observable universe?" Suppose you feel, as do many astronomers, that the universe is much larger than the observable universe
Do you think there is any way to obtain direct evidence for this larger universe?
Work is done on an object when you lift it against gravity. How does this work relate to gravitational potential energy? If the lifted object is dropped, what becomes of this energy?
What will be an ideal response?
Maximum magnetic force occurs when electrons move
A) in the same direction as the magnetic field. B) opposite to the magnetic field direction. C) perpendicular to the magnetic field direction. D) at non-right angles to the magnetic field direction. E) none of the above
A jet has an angular length of 10 seconds of arc and flows from a star at a distance of 2,000 pc. How far does this jet extend away from the star?
a. 20,000 pc b. 20,000 AU c. 20, 000 ly d. 20,000 miles e. 20,000 km