Geologists gain understanding of the formation of magma and igneous rocks by making field observations, geochemical analyses, and laboratory experiments. Give an example of each
What will be an ideal response?
This is an open-ended question where students may refer to field studies of modern or ancient volcanoes, volcanic rock, and ancient intrusive rock exposed to the surface by erosion; geochemical studies including the identification and measurement of the abundances of elements in igneous rocks; laboratory experiments including melting and/or crystallization studies that mimic the temperature and pressure conditions inside Earth.
You might also like to view...
By enacting so-called "right-to-work" laws, southern states made it easier for factory workers to form unions and bargain with employers from a position of strength
Indicate whether the statement is true or false.
Based on the principle of Cross-Cutting Relations, which of the following statements are right?
a. If one geologic feature cuts across another, the feature that has been cut is younger b. Younger features cut older ones c. Cross cutting relations do not provide directly the relative age d. If a fault cuts across and displaces layers of sedimentary rock, then the fault must be younger than the layers. e. Both b and d
Atmospheric pressure is produced by the weight of a column of air above a unit area of the Earth's surface.
a. true b. false
During the ____, tornadoes are most likely to form over the southern Gulf states when the polar-front jet is above this region
a. late spring b. early spring c. autumn d. winter e. summer