Which of the following statements is correct?
A) Adenine and guanine are both purines.
B) Adenine and guanine are both pyrimidines.
C) Adenine is a purine and guanine is a pyrimidine.
D) Adenine is a pyrimidine and guanine is a purine.
A
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An airplane flies at 40 m/s at an altitude of 50 m. The pilot drops a heavy package, which falls and strikes the ground. Where, approximately, does the package land?
A) beneath the plane B) 400 m behind the plane C) 500 m behind the plane D) more than 500 m behind the plane E) none of the above
On this southern continent, which side has a plate boundary?
A. both sides B. neither side C. the left (west) side D. the right (east) side
Which rock property is associated with void spaces?
A. porosity B. permeability C. perkability
What feature in this image is indicated with arrow X? (Note: it is made of sediments.)
A) Deep-sea fan B) Accretionary wedge C) Turbidity current D) Deep-ocean trench