The most important element in Eratosthenes' calculation of Earth's size was that the angle measurements of the Sun's rays with the pillar and reflection of sunlight in the well be
A. the same rays of the Sun.
B. exact.
C. simultaneous.
D. tested by other observers.
Answer: C
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________ is the downslope movement of a coherent block of Earth material
Fill in the blank(s) with correct word
Scientists search for fossil fuels in many ways. Sending a sound wave into the ground (by exploding dynamite, thumping the ground with a large weight, or using an electric vibrating machine) and measuring its return to the surface at receiving
stations is called ________ surveying. A) sonar B) geologic C) destructive D) seismic E) dynamite
The rock cycle links different types of minerals to one another by processes.
Answer the following statement true (T) or false (F)
The synthesis of a certain drug can be carried out with 91.7% yield. In one experiment 14.8 g of the drug was obtained. What was the theoretical yield for this experiment?
A) 13.6 g B) 15.8 g C) 16.1 g D) 16.9 g