Valuable ore deposits and gem crystals are often associated with:
a. oceans
b. oil deposits
c. thin crustal areas
d. igneous intrusions
Which of the following shows a possible sequence that leads to the formation of sedimentary rocks?
a. squeezing, heating, bending, folding
b. rising, weathering, erosion
c. weathering, deposition, compaction, cementation
d. melting, cooling, crystallization
Answer (3)
For the first question:
Valuable ore deposits and gem crystals are often associated with igneous intrusions. So for this question the correct option is option “d”. An example like the Pegmatite’s, which are a form of igneous intrusions, is responsible for the creation of variety of gems like topaz and tourmaline.
For the second question:
For this specific question, option “c” seems to be the correct option. Weathering, deposition, compaction, cementation are the possible sequence that leads to the formation of sedimentary rocks.
Valuable ore deposits and gem crystals are often associated with igneous intrusions and The possible sequence that leads to the formation of **sedimentary rocks **is weathering, deposition, compaction, cementation. Thus, the correct options are option D and C.
Sedimentary rocks are types of rocks that are formed through the accumulation and lithification (compaction and cementation) of sediment particles. Sediments can include fragments of rocks, minerals, organic material, and other debris that are transported and deposited by water, wind, ice, or gravity.
Over time, these sediments undergo compaction and cementation processes, where the particles are pressed together and bound by minerals, creating solid rock formations. Sedimentary rocks often exhibit distinct layers or stratification, and they can contain fossils and provide valuable information about Earth's history and past environments.
Examples of sedimentary rocks include sandstone, limestone, shale, and conglomerate.
Learn more about **Sedimentary rocks, **here:
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The correct answer for the first question is option "d", as valuable ore deposits and gem crystals are associated with igneous intrusions. For the second question, the correct sequence for forming sedimentary rocks is option "c", which includes weathering, deposition, compaction, and cementation.
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