In Addition to Cutting Laterally, Streams Can Also Cut Downward

question 13

Multiple Choice

In addition to cutting laterally, streams can also cut downward in their channels to form deep valleys and canyons. What best explains how streams can cut downward through solid rock?

• A) transported sediment causes abrasion of bedrock.
• B) water flowing rapidly over the bedrock causes erosion.
• C) acidic water causing chemical weathering of the bedrock.
• D) physical weathering of bedrock by freeze and thaw action.
• E) occurs in areas where streams encounter weaker layers of bedrock.

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Definitions:

Minimum-Wage Law

A regulation that sets the lowest hourly wage a worker can legally be paid.

Negative Income Tax

A proposed system where individuals earning below a certain amount receive supplemental pay from the government instead of paying taxes.

Earned Income Tax Credit (EITC)

A refundable tax credit for low- to moderate-income working individuals and families, aimed at reducing the tax burden and encouraging employment.

Utilitarianism

A theory in normative ethics holding that the best action is the one that maximizes utility, generally defined as that which produces the greatest well-being of the greatest number of people.