The Reason Leap Years Have an Extra Day Is to Account

question 80

Multiple Choice

The reason leap years have an extra day is to account for the fact that the

• A) Earth's rotation period is slowly increasing because of tidal effects.
• B) year is not exactly equal to an integral number of days.
• C) day is not exactly 24 hours because of Earth's periodically varying rotation period.
• D) length of the year varies with a period of four years because of precession.

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Definitions:

Petroleum

A liquid mixture of hydrocarbons that is present in certain rock strata and can be extracted and refined to produce fuels including gasoline, kerosene, and diesel oil.

Domestic Fuel

Fuels used for household purposes, such as cooking, heating, or electricity generation, which include natural gas, coal, and biofuel.

Net Energy Ratio

A measure comparing the amount of energy delivered by a system to the amount of energy used to build, maintain, and operate the system.

Agriculture Sector

The segment of the economy that is involved in the production of crops and livestock.