12 Questions
What is the second most abundant type of sedimentary rocks?
Terrigenous clastic rocks
What is the primary material that limestones are composed of?
Calcium carbonate
What term is used to refer to limestones due to their composition of calcium carbonate?
Calcareous
Which of the following minerals is NOT a principal mineral in carbonate sediments and rocks?
Halite
Which type of marine organisms is mentioned to have hard parts made of calcium magnesium carbonate?
Echinoderms
What percentage of magnesium substitution makes calcite less stable?
11% - 19%
What are the two main processes by which carbonate sediments and rocks are formed?
Biomineralization and direct chemical precipitation
Why is limestone economically important?
It plays a role in the global carbon cycle and acts as a reservoir for oil and gas
Which of the following organisms is NOT mentioned as contributing to biogenic carbonate formation?
Diatoms
What is the primary reason for the concentration of warm-water carbonate depositional settings within 30° north and south of the equator?
The relatively constant and warm seawater temperatures throughout the year
What is the significance of cementation in the formation of carbonate rocks?
It is the process that consolidates unconsolidated carbonate sediments into rocks
What role does limestone play in the global carbon cycle?
It stores a significant amount of carbon on Earth
Test your knowledge on biogenic and chemical sediments composed of calcite, specifically focusing on limestones as the second most abundant sedimentary rocks. Learn about their formation in various environments and the role of biomineralized calcium carbonate in limestone composition.
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