Geosciences
Distinguish among three broad categories of sedimentary environments and provide an example of each. List several sedimentary structures and explain why these features are useful to geologists. Sedimentary rocks are … Read More
The first mention of contact metamorphism/metamorphic phenomena dates back to the end of the eighteenth century when James Hutton observed that, the rocks surrounding a granitic body at Glen Tilt … Read More
Identify and describe the six major igneous textures. The term texture is used to describe the overall appearance of a rock based on the size, shape, and arrangement of its … Read More
Describe how magmatic differentiation can generate a body that has mineralogy (chemical composition) that is different from its parent magma. Geologists have observed that, over time, a volcano may extrude … Read More
Distinguish between compositional and structural variations in minerals and provide one example of each. Many people associate the word crystal with delicate wine goblets or glassy objects with smooth sides … Read More
Explain how index minerals are used to establish the metamorphic grade of a rock body. In areas affected by metamorphism, geologists can observe the usually systematic variations in the mineralogy … Read More
Describe some of the hypotheses on the origin of life and the characteristics of early prokaryotes, eukaryotes, and multicelled organisms. The oldest fossils provide evidence that life on Earth was … Read More
In contrast to minerals, rocks are more loosely defined. Simply, a rock is any solid mass of mineral, or mineral-like, a matter that occurs naturally as part of our planet. … Read More
The agents of metamorphism include heat, pressure, directional stress, and chemically active fluids.During metamorphism, rocks may be subjected to all four metamorphic agents simultaneously.However, the degree of metamorphism and the … Read More
