A principle by which sedimentary beds originate as continuous layers until they grade into another rock type or thin out is called the ________
A) principle of lateral continuity
B) principle of original horizontality
C) principle of cross-cutting relationships
D) principle of inclusions
Answer: A
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What does a galvanometer measure?
A. electric voltage. B. magnetic fields. C. electric current. D. none of the above
Shifting cultivation is most commonly practiced in
A) core countries. B) tropical and subtropical regions. C) southern Africa and Australia. D) Siberia.
The Dutch have responded to the challenge of global warming by
A) building extensive dams further from the shore to protect the coastline. B) building extensive seawalls. C) embracing alternative renewable energy sources such as wind and solar power. D) converting to geothermal energy. E) converting to food imports only.
Though they are called ________, these objects are not really empty space but very, very dense objects, so dense that their gravity pulls nearby material irresistibly in toward them, even light. Some of this material is altered on its way in to this death spiral — and it gives off X-rays in two jets.
A) dark matter B) degenerate matter C) dark energy D) black holes