How are basalt and gabbro similar, and how are they different? How about andesite and diorite?
Rhyolite and granite? How are basalt, andesite, and rhyolite the same, and how are they different?
How about gabbro, diorite, and granite? What will be an ideal response?
Basalt and gabbro are both felsic rocks, but basalt is aphanitic due to rapid cooling and gabbro is
phaneritic due to slower cooling. The same is true for composition but not cooling rate of andesite, the
fine-grained, and diorite, the coarse-grained, equivalents. Rhyolite is a fine-grained, rapid cooling
felsic rock, and granite is a coarse-grained, slow cooling felsic rock too. Basalt, andesite, and rhyolite
are increasingly felsic fine-grained rocks, and gabbro, diorite, and granite are increasingly felsic
coarse-grained rocks. The first set is extrusive, and the second set is intrusive
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What will be an ideal response?
The ________ ended with the greatest mass extinction ever to occur on Earth.
A. Paleozoic Era B. Tertiary Period C. Cenozoic Era D. Precambrian interval E. Jurassic Period
This vegetation type of drought-resistant grasses also refers to a very dry climate, characteristic of southern Russia, Ukraine, and northern Central Asia
A) steppe B) tundra C) taiga D) volga E) none of these
What helps groundwater penetrate rock and enhance dissolution processes?
A. joints B. blowing winds C. slope D. soil properties E. atmospheric composition