What are glacial striations, and how did Wegener use them to support his hypothesis of continental drift?
What will be an ideal response?
Answer: Glacial striations are gouges or grooves that scratch the ground surface as a glacier moves over the land surface. They reveal the direction of ice flow. Wegener used striations on several different continents to show that at one time the continents had been joined together.
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Which statement best describes the surface of Io?
a. dark and dirty ice, heavily pocked with craters b. old and dark on some portion, but cratered with a young bright grooved terrain c. icy crust free of craters with a liquid water ocean beneath d. covered in active sulfur-based volcanoes e. mostly water ice mixed with methane
What is the MOST important role that lipids play in living organisms on Earth?
A) basic functioning of living organisms B) long-term energy storage and cell structure C) short-term energy storage D) information storage
How a ship floats is described in terms of
A) Bernoulli's principle. B) Pascal's principle. C) Archimedes' principle. D) Poiseuille's equation. E) Torricelli's equation.
What is meant by the "normal" to a surface?
a. a line perpendicular to the surface at a given point b. the angle between the surface and the light ray c. a line parallel to the surface at a given point d. the direction of a reflected ray