What is the tidal datum in reference to in regions with semidiurnal mixed tides?
A) Mean lower low water
B) Mean low water
C) Tidal range
D) Mean tide
A
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Among the world's primary food security concerns is that the world's growing urban areas continue to be entirely dependent on the world's shrinking rural areas for food
Indicate whether this statement is true or false
A radioactive isotope of element X (which is the parent isotope) is discovered in different amounts in four rocks. Which rock is oldest?
- 15% of element X remains in Rock A
- 28% of element X remains in Rock A
- 57% of element X remains in Rock A
- 75% of element X remains in Rock A
Which of the following does NOT influence whether sediment is picked up by a stream?
A. whether the stream flows north-south or east-west B. size and density of the sediment C. location of the sediment in the stream D. turbulence of the moving water
Which statement about compaction is false?
A) Grains of sand are crushed into a smaller volume. B) Spaces between grains are decreased. C) Flakes of minerals are broken. D) Compaction may be caused by the weight of overlying sediment.