When your grandma was a young girl she lived in a house on the bank of a river. When she returns to the house after 60 years, she is surprised to see that the river has moved several feet away from the bank
Explain how the river shifted its position.
The home was probably built on the inside of a meander in the river. The water on the inside of a meander moves more slowly than the water on the outside. For this reason, larger sediments and more sediment are deposited by the stream on the inside of the curve. On the outside of the curve, the faster water erodes the bank. So over time, the river shifts away from the inside curve.
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Imagine two magmas that are identical in all respects (for example, same temperature, pressure, volume) except that one magma has more silica than the other. Which magma will have the higher viscosity?
a) The magma with more silica will be more viscous. b) The magma with less silica will be more viscous. c) The magmas will have the same viscosity. d) There is not sufficient information to establish the relative viscosities of these magmas. e) Silica content does not affect magma viscosity.
Which of the following best describes how far the Moon is from Earth and the Sun?
a. The Moon is much closer to the Sun that it is to the Earth b. The Moon is much closer to the Earth than it is to the Sun c. The Moon is closer to either Earth or the Sun depending on the time of year d. The Moon is about the same distance from Earth as it is from the Sun
How deep would a submarine need to dive to feel no motion from surface waves with a wavelength of
200 meters ? a. less than 50 meters b. less than 100 meters c. below 50 meters but above 100 meters d. below 100 meters
How do metamorphic processes form ore deposits? What are some of the ores that are formed? What will be an ideal response?