Beneath continents, rising basaltic magmas are contaminated by sediments and continental-crust rocks, altering magma compositions; the resultant andesitic-to-rhyolitic magmas have high contents of SiO2, relatively low temperatures, and high viscosity.
Answer the following statement true (T) or false (F)
True
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What type of eruption is mainly responsible for producing plateau basalts? What will be an ideal response?
What accounts for the view that we cannot protect the environment while simultaneously providing for people's needs?
What will be an ideal response?
All of the following offer additional evidence supporting the theory of plate tectonics except for ________
A) changes in the Moon's orbit due to shifting plates B) ocean floor sediment cores C) hot spots D) measurements of plate motions
A weather warning indicates that
a. the atmospheric conditions are favorable for hazardous weather over a particular region. b. hazardous weather is either imminent or occurring within the forecast area. c. hazardous weather is likely to occur within the forecast area during the next 24 hours. d. hazardous weather is frequently observed in a particular region. e. hazardous weather is occurring in nearby areas.