Answer to Question 1
Answer: Both samples are composed of the same minerals. However, the fragment from the wall of the volcano is the sample with minerals readily visible to the naked eye. It is very difficult to see what composes cooled volcanic rock, so the sample with a few visible crystals surrounded by a black, nondescript background would be the cooled rock from the molten river.
Answer to Question 2
Answer: Neptunists envisioned concentric shells of different types of rocks and minerals that precipitated in sequence from a primordial ocean solution that was extremely rich in dissolved materials. In his vision, the interior of the planet was cold, and volcanoes were rare, relatively recent phenomena related to the natural burning of subterranean coal beds. So, the bottom layer was believed to be thick, massive, mostly unlayered rocks, whose bottoms were never exposed to view, Primitive Rocks. These rocks formed, according to Neptunists, by precipitation and settling of the least-soluble silicate minerals before dry land appeared. The Primitive Rocks are overlain by the so-called Stratified Formations, distinctively layered rocks composed of precipitates of more-soluble minerals mixed in places with fragments worn from highlands of Primitive Rocks, which were gradually exposed as the enclosing ocean diminished in depth.
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Team of geologists collecting samples for paleomagnetic analysis at Sangiran, Java.
In 2008, the U.S. economy suffered a gaping wound as several trillion dollars were ripped out of it.
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(a) In amniocentesis, a syringe needle is inserted through the walls of the abdomen and uterus to co
Hierarchical clusters in a microarray experiment using RNA samples from Saccharomyces cerevisiae