ACTIVITY 6.4 Biochemical and Chemical Sediment and Rock Name: Course/Section: Da

Question

ACTIVITY 6.4 Biochemical and Chemical Sediment and Rock Name: Course/Section: Date: are grains of sediment made by the biochemical processes of organisma, so they are grains of A. Seashells ed where When you find a rock with a fossil seashell, then you have found evidence that the rock contains sediment deo the sea animal lived (ie., in the ocean, in a marine environment). Some limestone is entirely made of the seascs pieces of seashells, Obrain a seashell (e-. hard clam shell)l and draw it to the right of this paragraphs it, then fill in the outline with details of what che shell looks like inside or out. Next, place the shell inco a plastie a bng and take the bag to the hammering station in your lab. Lightly tap the bag with the hammer to break up the pieces. Return to your table and view the broken pieces of shell with a hand lens. Ie may be casiest to trace break up the shell into 1. The shell fragments thar you just made are called clasts (from the Gireek lvaós, meaning "broken in pieces"). Geologists commonly refer to several different kinds of clastic sediment. Circle the one that you just made . Pyroclastic sediment-volcanic bombs and/or volcanic rocks fragmented by volcanic eruption bioclastic sediment -broken picces of shell, plants, and/ot other parts of organisms sdliciclastic sediment-broken pieces of silicate mincral crystals and/or rocks c rocks containing them 2. Compared to FIGURE 6.3, what is the roundnes of your clasts? 3. What is the soundness of che clasts in this picture (x I scale) Explain how and in what environment the shell clasts could have attained their roundness 4. Some limestone is made of shells that are calcareous alcite or aragonite), like visible seashells, but they are microscopic and cannot even be seen with a hand lens. Chalk is such a limestone. Some chalk used with modern blackboards is clay plaster-of Paris, rather than real chalk. Obain a pic of chalk from your lab room or instructor. Explain how dilute He (hydrochloric acid) can be used to help you test your chalk and find out if and report the results of your test is real chalk or not. Then conduct your tes 5 Based on FIGURE 6.10 (page 165), how and where does chalk form

Explanation / Answer

Ans- 1- siliciclastic sediment

Because these are made up of broken pieces of rock and minerals crystals.

Ans-2- the roundness of the shell is 3.2 cm.

Ans-3- the roundness of these clasts are 1.5 cm.

The hot environment causes decay of the Rock and other organic materials and cause roundness of the shell.

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