If You Were Studying the Sediments Along the Beach and Narrow

question 51

Multiple Choice

If you were studying the sediments along the beach and narrow continental shelf here,how could you tell that the river once flowed from the volcanoes straight out to the coast,instead of flowing somewhere inland as it does now?

• A) Look for mineral and rock clasts of volcanic origin in the newest sediments of the beach and continental shelf
• B) Look for volcanic ash
• C) Look for mineral and rock clasts of volcanic origin in the older sediments of the beach and continental shelf
• D) Both a and b are correct.

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Definitions:

Arsenic Ions

Ions that contain arsenic in different oxidation states, often toxic and present in various environmental and industrial contexts.

Orpiment

A natural mineral composed of arsenic sulfide (As2S3), historically used as a pigment and with various industrial and medicinal applications.

Soluble Sulfide

A compound containing the sulfide ion that is soluble in water, often producing hydrogen sulfide gas upon contact with acid.

Arsenic

A toxic metalloid element with the symbol As and atomic number 33, known for its various allotropes and compounds.