The Soviet Union established the _______________ to unite the countries of eastern Europe in the Soviet defense bloc.
Fill in the blank(s) with the appropriate word(s).
Warsaw Pact
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What is the main difference between a conceptual model and a physical model?
A) A physical model represents the shape and form while a conceptual model describes how a system behaves. B) A conceptual model represents the shape and form while a physical model describes how a system behaves. C) Physical models can only be used to represent the real world. D) Conceptual models can only be used to describe concepts. E) Physical models and conceptual models can be used to describe the same things.
The genus Ichthyostega is the earliest known amphibian. Indicate whether the statement is true or false
The Richter scale assesses the 1906 San Francisco earthquake and the 1964 Alaska earthquake as both being of magnitude 8.3. However, on the moment magnitude scale, the San Francisco earthquake is probably equivalent to a Richter magnitude 7.8 and the Alaska seism is equivalent to a 9.2. The Alaska earthquake was at least 100 times bigger.
Answer the following statement true (T) or false (F)
Older lithosphere is destroyed in association with ________
A) deep-sea trenches B) fracture zones C) hydrothermal vents D) mid-ocean ridges E) spreading centers