Placers Are Sedimentary Deposits Where Valuable Minerals Have Been Hydraulically

question 11

Multiple Choice

Placers are sedimentary deposits where valuable minerals have been hydraulically sorted. Which of the following mineral properties are required for hydraulic sorting by streams to be effective?

• A) high density and high chemical resistance
• B) high solubility and high density
• C) well-rounded shaped and high chemical resistance
• D) small grain size and well-rounded shape
• E) large grain size and high solubility

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Definitions:

Understanding Conservation

The cognitive ability to recognize that quantity or amount does not change when its form or appearance is altered.

Cognitive Development

The process by which an individual's ability to think, understand, and interact with the world evolves throughout life.

Object Permanence

The understanding that objects continue to exist even when they cannot be seen, heard, or otherwise sensed, a concept crucial in the cognitive development of infants.

Formal Operational

A stage in Piaget's theory of cognitive development, marked by the ability to think abstractly, reason logically, and plan systematically.