Please I want someone to answer all these questions sandstone,limestone, and/or
ID: 114507 • Letter: P
Question
Please I want someone to answer all these questions
sandstone,limestone, and/or brick. Some people may consider this lack of varability Dorng, Du allows us to focus our attention and really get comfortable with identifying the geological materials that we encounter daily. Although some of the materials we will see today are natural and others are manmade, all of them are sedimentary in origirn OBJECTIVES e Become more familiar with some common building materials of sedimentary origirn . Explore sedimentary features found in sandstones and limestones PART III: Campus Tour Grab a hand lens, and please follow your TA on a short walking tour of campus (Figure 1) Stop 1 - Sangren Hall Pedestrian Walkway: Lining the sidewalks in front of Sangren Hall are large blocks of a common sedimentary rock called limestone. Your TA will use dilute HCl to demonstrate to you that the limestone is made up of the mineral calcite. You've probably passed these rocks numerous times before without much notice. I don't blame you! At first glance, these limestones are dull and gray Upon closer inspection, however, there are a number of interesting features to note including the presence of round nodules and the occasional fossil. Let's see if you can spot these features. Your TA will lead you to a location where the remains of ancient corals can be easily observed. Note, these rocks and the corals they contain are over 400 million years old! 01: Why does the limestone firg when hydrochloric acid tonches it? Be specific about the chemical reaction that is taking place, and the tbpes of bonds that are broken, and the compounds that are created Q2: What type of organism is a coral? i hat does the presence of corals indicate about where these limestones formed? Stop 2 - Sangren Hall Columns: The large columns outside the southeastern entrance to Sangren hall are quite interesting. Like the gray blocks lining the sidewalk out front, these are blocks of limestone Here, however, the rocks are not dull and gray. Instead, the color of the rock is what geologists call buf, and it is full of small exoskeletons of ancient marine organisms (e.g,, mollusks). See is you can find the skeletal fragments that comprise this rock (use your hand lens). Also note, the many small holes in the rock. These are called pores, and they are a common feature of sedimentary rocks. 3: Many prople think incorretly that oil and natural gas occurs in large underground pools, Instead, petroleum is actualy ound in small voids (pores) within sedimentary rocks. Racks with the capacity to store and transmit fuids are referred to geologists and engineers as reservoirs. What bpe of limestone, the gray limestone at stop 1, or the buff colored limestone at stop 2, would be better as an oil reservoir? Explain your reasoning. 4: What can you say about the environments where the limestones at Stops 1 and 2 were deposited? Think about this in terms of the energy at the depositional settingExplanation / Answer
1. When dilute HCl comes in contact with limestone, the acid begins to effervesce with a chemical reaction as shown below
CaCO3 + 2HCl =CO2 +H2O + Ca+2 +2Cl-2
Mineral calcite (CaCO3) react with HCl to form CO2 and H2O and dissolved Ca+2 and Cl-2. The liberation of CO2 in the reaction indicates the reaction is taking place in the presence of calcite or other carbonate mineral is present.
2. Corals are marine invertebrates and they grow in the compact colonies and they inhabit tropical oceans and secrete calcium carbonate to form a hard skeleton.
The rock is either a reef or closely associated with a reef and it was developed in high energy condition as due to lack of grained sediment. We can imagine it as a rubble pile of the skeleton lying on the bottom with almost no sediment intermixed with them.
3. Rock sample at site 1 is much better candidate for oil to hold on as they are more tightly packed and they provide enough space to hold the oil within it whereas the limestone at site 2 cant act as a brrier to the oil it’ll help in better migration of oil with large opening in its structure.
4. The limestone present on site 1 is the product of high energy condition whereas the limestone present in location 2 is a product of the low energy conditions which are associated with the fine-grained sediment in the rock whereas the rock at the site 1 lack the presence of free sediments.