Leyna Finds That the Number of Hours She Sleeps Each

question 66

Multiple Choice

Leyna finds that the number of hours she sleeps each night is related to the scores she receives on quizzes the next day. As her sleep approaches 8 hours, her quiz scores improve; as her sleep drops to 5 hours, her quiz scores show a similar decline. Leyna realizes that __________.

• A) there is a negative correlation between the number of hours she sleeps and her quiz grades
• B) there is a positive correlation between the number of hours she sleeps and her quiz grades
• C) her low quiz scores are caused by sleep deprivation the night before a quiz
• D) she should sleep about 10 hours a night to ensure 100 percent quiz grades

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Definitions:

Unweathered Lava

Refers to lava that has not been exposed to weathering processes and therefore maintains its original texture and composition.

Well-developed Soil

Soil that has gone through all stages of soil formation, resulting in distinct layers or horizons, and is capable of supporting plant life effectively.

Ash Blanketing

The covering of large areas with volcanic ash following an explosive volcanic eruption.

Pumice

Volcanic rock, especially of felsic or intermediate composition, containing many vesicles (holes) formed by expanding gases in magma.