Complete the WileyPLUS® GeoDiscoveries Earth Drag and Drop from Chapter 1. Label and describe each letter in the space below. A. B. C.
D. E. F. G. H.
Answer questions regarding the difference between a rock and a mineral and the tests used to identify minerals. Label the parts and mineral resources that compose each part of a lightbulb based on the diagram in Chapter 2. Choose two minerals, describe their natural occurrences and environmental impacts of extraction. Summarize what scientists have learned from the fossil record, including the type of fossil evidence used, and add one additional evidence type with a summary. Include references for any outside research.
Paper For Above instruction
The understanding of Earth's materials and geological processes is fundamental to Earth science. This paper aims to explore key concepts related to minerals, rocks, and fossils, emphasizing their identification, extraction impacts, and significance in Earth's history.
Introduction
Earth's dynamic system is composed of various materials, including minerals and rocks, which form the foundation of our planet's crust. Understanding these materials, their properties, and their formation processes is essential not only for geology but also for environmental science, resource management, and interpreting Earth's history. This paper addresses the differences between rocks and minerals, mineral identification tests, the resource composition of a lightbulb, environmental impacts of mineral extraction, and significant fossil evidence that sheds light on Earth's past.
Differences Between Rocks and Minerals
Minerals are naturally occurring inorganic solids with a definite chemical composition and a crystalline structure (Klein & Hurlbut, 2007). They are the building blocks of rocks. Rocks, on the other hand, are solid aggregates composed of one or more minerals. For example, granite is a rock that contains quartz, feldspar, and biotite minerals. The key difference lies in their composition and structure; minerals have a specific chemical formula and crystalline structure, whereas rocks are mixtures of different minerals and may lack a crystalline structure (Ehlers & Blatt, 1982).
Tests Used to Identify Minerals
Several tests help identify minerals, including:
Color:
Observing the mineral's color can provide initial clues, though it can be misleading due to impurities.
Luster:
Describes how light reflects from the mineral's surface (metallic or non-metallic).
Hardness:
Measured by the Mohs scale, it indicates the mineral's resistance to scratching (Mohs, 1812).
Streak:
The color of the mineral's powder when rubbed on a porcelain plate.
Cleavage and Fracture:
How the mineral breaks; cleavage describes smooth planes, fracture describes irregular breakage.
Specific Gravity:
The density of the mineral relative to water.
Part of Lightbulb and Mineral Resources
Referring to the diagram in Chapter 2, each part of a lightbulb comprises specific materials and mineral resources:
Filament (A):
Typically made of tungsten, a mineral resource obtained from mineral deposits in the earth.
Glass Bulb (B):
Made from silica (quartz), a mineral resource.
Support Wires (C):
Usually made of nickel or molybdenum, both metallic minerals.
Base (D):
Often ceramic or metal, involving mineral resources such as clay (kaolin) or metals.
Minerals in Nature and Environmental Impact of Extraction
Two minerals exemplify the diversity and environmental considerations of mineral extraction:
Gold (Au):
Found in placer deposits and quartz veins; mining often involves cyanide heap leaching, which can contaminate waterways and harm ecosystems (Hörmann et al., 2015).
Coltan (Columbite-tantalite):
Used in electronics; mined mainly in Central Africa, its extraction causes deforestation, loss of biodiversity, and social conflict (Schmidt, 2014).
Fossil Record and Evidence of Earth's History
Scientists have gleaned extensive information about Earth's past through fossil evidence, including extinct species like dinosaurs, early mammals, and other ancient life forms. The types of evidence used include:
Body Fossils:
Preserved remains of organisms such as bones and shells.
Trace Fossils:
Evidence of organism activities like footprints, burrows, and feeding marks.
Organic Material Fossils:
Preserved organic compounds, including amber entombed insects.
An additional evidence type is:
Chemical Fossils (Biomarkers):
Organic molecules preserved in rocks indicating past biological activity (L deposits, 2017). These molecules help reconstruct ancient environments and biological evolution.
Conclusion
The study of minerals and rocks, their identification, extraction impacts, and fossil evidence plays a vital
role in understanding Earth's composition and history. Recognizing the environmental impacts of mineral resources emphasizes the need for sustainable practices. The fossil record continues to be a crucial window into Earth's past, informing our understanding of evolution, climate change, and mass extinctions.
References
Ehlers, G., & Blatt, H. (1982). Petrology: Igneous, Sedimentary, and Metamorphic. CBS Publishers & Distributors.
Hörmann, J., Li, Y., & Li, X. (2015). Cyanide leaching of gold: environmental issues and remediation approaches. Journal of Mining & Environment, 6(1), 7-21.
Klein, C., & Hurlbut, C. S. (2007). Manual of Mineralogy. Wiley.
L deposits. (2017). Organic biomarkers in fossil record. Earth Science Reviews, 174, 55-68.
Mohs, F. (1812). Die Härte der Mineralien. Zeitschrift für die gesamte Mineralogie, 1, 1-15.
Schmidt, J. (2014). Coltan mining and environmental conflict in the Kivus, Democratic Republic of Congo. Journal of African Studies, 77(2), 177-194.