The Hawaiian Islands are predominantly made up of
A) intrusive igneous rock.
B) volcanic igneous rock.
C) sedimentary rock.
D) metamorphic rock.
Answer: B
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When an electron in a hydrogen atom drops from the second to the first excited energy state it emits a bright red emission line called hydrogen alpha
Indicate whether the statement is true or false
The overall efficiency of a power plant can be increased by "co-generation", that is, by ________
a. recycling the waste heat from a power plant back to the boiler b. raising the temperature of the steam by the use of two boilers c. combining two types of steam engines to generate electricity d. generating electricity and using some of the waste heat to provide process steam
The most important highlight of Precambrian Time was the
A) explosion of life. B) asteroid impact that resulted in the formation of our Moon. C) accumulation of free oxygen in the atmosphere. D) emergence of reptiles.
Which exoplanet detection method requires us to be in the same plane as the exoplanetary system?
A. Direct imaging B. Transit method C. Radial-velocity method D. Gravitational lensing E. None of these choices are correct.