Answer :
Final answer:
Limestone and sandstone are sedimentary rocks found in Bryce Canyon, with limestone consisting mainly of calcium carbonate and often formed from organic materials, while sandstone is composed of sand-sized particles like quartz.
Explanation:
Limestone and sandstone, the rocks that make up the spires of Utah's Bryce Canyon, are types of sedimentary rocks. This category of rocks is formed from the accumulation of sediment, which is compacted and cemented over time. Specifically, limestone is composed primarily of calcite (calcium carbonate) and is often formed from marine organisms' skeletal fragments and other organic debris. It reacts with dilute acid due to the presence of calcium carbonate. On the other hand, sandstone is typically made up of sand-sized mineral particles or rock fragments, commonly quartz, and can also include minerals like feldspar. Varieties of sandstone include arkose and graywacke. Sandstone formations can sometimes exhibit features such as cross-bedding or ripple marks, indicating the environmental conditions under which they were deposited.
At places like Zion National Park and Bryce Canyon, sedimentary rock layers tell a geological story of the region's distant past, including its environments and the forces that have shaped it over millions of years. Features such as frost-wedging and chemical weathering further sculpt these sedimentary rocks into the breathtaking formations we see today.
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