Which marine resource is too expensive to recover at this time due to the low market value of the resource?
a. Magnesium compounds
b. Manganese nodules
c. Sand and gravel
d. Salt
e. Rare-earth elements
b
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How does petrified wood form?
a. permineralization – silica rich waters percolates and silicifies the wood b. aeration – the wood dries out and is then buried c. decomposition – bacteria break down the wood and replace them with organic compounds d. decomposition – bacteria break down the wood and replace it with inorganic compounds e. tectonism – wood is rapidly buried and subsequently uplifted
The Cascade Range in North America is predominately volcanic and igneous in character. Indicate whether the statement is true or false
The atomic mass of an atom may vary, but its atomic number does not. Indicate whether the statement is true or false
What is the main way that position of the continents can influence global sea level?
A. Continents at high latitudes provide a setting in which large ice sheets can form. B. Clustering of continents near the poles squashes the planet, causing sea level to rise. C. Continents near the equator receive higher amounts of rainfall. D. Clustering of continents near the poles causes ocean temperatures to fall substantially.