1) Which rocks are most useful in unraveling Earth\'s geologic history? A) phane

Question

1) Which rocks are most useful in unraveling Earth's geologic history?   

A) phaneritic igneous rocks

B) high grade metamorphic rocks

C) fossiliferous sedimentary rocks

D) meteorites

2 Pieces of one rock contained within another are called ________ and give evidence that smaller rock is ________ the main body.

A) coprolites, rejects from

B) inclusions, older than

C) surprises, more valuable than

D) xenoliths, younger than

3The task of matching geologic formations of the same age over vast distances (like between continents) is termed ________.

A) correlation

B) cross dressing

C) lithification

D) stratification

4How can radiometric dating yield reliable values for the ages of minerals, rocks and some fossils?

A) The decay constants are fixed and well measured for isotopic decay.

B) One only needs to analyze for the parent isotope.

C) The physical conditions that control decay, like temperature and pressure, are always well known.

D) There are absolute fossil ages to compare to and test the radiometric clocks.

5 Which of the following denotes the divisions of the geologic time scale in correct order of decreasing lengths of time, beginning with the longest time interval and ending with the shortest?

A) eon, era, epoch, period

B) era, period, epoch, eon

C) eon, epoch, period, era

D) eon, era, period, epoch

Explanation / Answer

1) D) meteorites. Because by dating of meteorites the age of the Earth is calculated and is formed 4.6 billion years ago. So it is the perfect method to identify Earth's geologic history.

2) B) inclusions, older than. Because geological principles state that if a fragment of rock is included, that is entirely surrounded by rock, it must be older than the surrounding rock.

3) A) correlation

4) D) There are absolute fossil ages to compare to and test the radiometric clocks.

5) D) eon, era, period, epoch

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