Glaciers are like dirty snowballs because they
A. are round.
B. roll like a ball.
C. are always melting.
D. consist of debris embedded in ice.
Answer: D
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________ energy is provided by processes that replenish themselves or are continuously present as a feature of the solar system.
A. Free B. Power C. Nuclear D. Renewable
The population pyramid of a city in southern Florida, Arizona, or even northern Japan may have a visual appearance of ________ because the city's population is dominated by elderly people
A) being "upside down" B) having a wide base C) having perfectly vertical sides D) being an "age-sex ratio" E) being "rightside-up"
Soil is composed of 70% mineral matter, 5% organic matter, and varying amounts of water and air totaling 25%
Indicate whether the statement is true or false
Which of the following pairs of amino acids has hydrophobic interactions?
A) alanine and glutamic acid B) aspartic acid and lysine C) leucine and phenylalanine D) serine and tyrosine