Describe dikes and sills using the appropriate terms from the following list: massive, discordant, tabular, and concordant
What will be an ideal response?
A dike is a tabular, discordant intrusive igneous body. A sill is a tabular, concordant, tabular body.
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The Middle to Late Devonian was a time of major reef building worldwide. Indicate whether the statement is true or false
What did the German Meteor expedition discover during their 1925 crisscross across the South Atlantic for 2 years?
A) ?a completely flat ocean floor B) ?the deepest part of the ocean's deepest trench C) ?a varied and often extremely rugged bottom profile D) ?evidence for seafloor spreading and plate tectonics
How is the ocean a reservoir for carbon? How is the carbon dioxide able to re-enter oceanic and atmospheric cycles?
The precession cycle has a periodicity of ____
a. 100,000 years b. 41,000 years c. 21,000 years d. 11,000 years