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Formation of Calcium Carbonate Investigation 5: Limestone Earth History Grade 6.

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Presentation on theme: "Formation of Calcium Carbonate Investigation 5: Limestone Earth History Grade 6."— Presentation transcript:

1 Formation of Calcium Carbonate Investigation 5: Limestone Earth History Grade 6

2 Quick Write In your ISN on page 74, titled Limestone Fizz Quick Write, please respond to the following question: In your ISN on page 74, titled Limestone Fizz Quick Write, please respond to the following question: How do you think limestone forms? What process of sedimentation might produce a rock that fizzes with dilute acid? How do you think limestone forms? What process of sedimentation might produce a rock that fizzes with dilute acid?

3 Fizzing of Limestone Limestone fizzes in acid because they contain calcite. Limestone fizzes in acid because they contain calcite. Calcite is one form of calcium carbonate. Calcite is one form of calcium carbonate. The fizzing is CO 2 (Carbon Dioxide) being releases. The fizzing is CO 2 (Carbon Dioxide) being releases.

4 Think About This… Scientists want to know… Scientists want to know… Where does calcium carbonate come from, and how does it get into the limestone? Where does calcium carbonate come from, and how does it get into the limestone?

5 Formation of Limestone Calcium carbonate does not dissolve in water (H 2 O). Calcium carbonate does not dissolve in water (H 2 O). If calcium carbonate forms in the sea or falls into the sea, it will sink to the bottom forming a layer. If calcium carbonate forms in the sea or falls into the sea, it will sink to the bottom forming a layer. The layer turns to rock and the rock is limestone. The layer turns to rock and the rock is limestone.

6 Where Does Calcium Carbonate Come From? Calcium Carbonate forms in the sea in two main ways: Calcium Carbonate forms in the sea in two main ways:

7 Where Does Calcium Carbonate Come From? Type1: Type1: Some animals use calcium to make their bones, shells, and scales. Some animals use calcium to make their bones, shells, and scales. The calcium in shells combines with carbon and oxygen to make CaCO 3 (calcium carbonate). The calcium in shells combines with carbon and oxygen to make CaCO 3 (calcium carbonate). When the animal dies, the calcium settles to the bottom and can be incorporated into the forming rock. When the animal dies, the calcium settles to the bottom and can be incorporated into the forming rock. Example: Oyster shells can be a main component of limestone. Example: Oyster shells can be a main component of limestone.

8 Where Does Calcium Carbonate Come From? Type 2: Type 2: Calcium carbonate also forms when CO 2 (carbon dioxide), exhaled by organisms living in the sea, reacts with calcium in the water. Calcium carbonate also forms when CO 2 (carbon dioxide), exhaled by organisms living in the sea, reacts with calcium in the water. Calcium carbonate forms right in the water and precipitates to the bottom. Calcium carbonate forms right in the water and precipitates to the bottom. Example: the reside at the bottom of our cups. Example: the reside at the bottom of our cups.

9 Calcium Carbonate Chemical Equation Ca(OH) 2 + CO 2 CaCO 3 H 2 0 Ca(OH) 2 + CO 2 CaCO 3 H 2 0


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