Why are sedimentary rocks and the processes that produce them more accessible than igneous and metamorphic rocks?


Sedimentary rocks are formed at or near Earth's surface. Most igneous and all
metamorphic rocks are formed deep inside Earth.

Physics & Space Science

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Which of the following statements about an open cluster is true?

A) All stars in the cluster are approximately the same color. B) All stars in the cluster are approximately the same age. C) All stars in the cluster have approximately the same mass. D) All stars in the cluster will evolve similarly. E) There is an approximately equal number of all types of stars in the cluster.

Physics & Space Science

The source of energy that keeps the Sun shining today is

A) nuclear fission. B) gravitational contraction. C) chemical reactions. D) nuclear fusion.

Physics & Space Science

In general, the brightest star in a given constellation is designated as alpha

Indicate whether the statement is true or false

Physics & Space Science

A series circuit consists of a 50-Hz ac source, a 40-? resistor, a 0.30-H inductor, and a 60-?F capacitor. The rms current in the circuit is measured to be 1.6 A. What is the power factor of the circuit?

A) 0.70 B) 0.56 C) 0.63 D) 0.59 E) 0.66

Physics & Space Science