Earth's first atmosphere (approximately 4.6 billion years ago) was most likely composed of ____
A) nitrogen and oxygen
B) hydrogen and helium
C) carbon dioxide and nitrogen
D) oxygen and carbon dioxide
B
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What are the important steps involved in critical thinking?
a. Be skeptical about everything you read or hear and be open to many viewpoints b. Look at the evidence and evaluate it as well as related information and a variety of opinions. c. Identify and evaluate your personal beliefs and biases. d. Identify and evaluate your personal beliefs and biases and be skeptical about everything you read or hear. e. Look at the evidence and evaluate it as well as related information, identify and evaluate your personal beliefs and biases, be skeptical about everything you read or hear and be open to many viewpoints.
During the past ice age, landmasses were generally
A) pressed down into the asthenosphere by the load of ice. B) elevated, because ice is lighter than rock. C) unaffected by the climatic conditions of the time. D) more exposed to the atmosphere.
Earth can be visualized as a giant machine driven by which of the following engines?
A. regional and local B. surficial and heat C. buried and exposed D. expanding and condensing E. solar and internal
Which of the following is considered to be slow mass wasting?
a. solifluction b. slump c. earthflow d. mudslide