The Continental Crust Has an Average Age of ________ and a Maximum

question 25

Multiple Choice

The continental crust has an average age of ________ and a maximum age of ________.

• A) 1.2 billion; 3.9 billion
• B) 1.6 billion; 4.0 billion
• C) 1.8 billion; 3.2 billion
• D) 2.2 billion; 4.4 billion

---

Definitions:

Lake Zone

An area or region surrounding or within a lake, characterized by distinct ecological and environmental attributes.

Benthic Zone

refers to the ecological region at the lowest level of a body of water such as an ocean, lake, or stream, including the sediment surface and some sub-surface layers.

Littoral Zone

The littoral zone is the area of a lake or ocean shore that is close to the shore, often characterized by shallow waters, where sunlight reaches the bottom allowing aquatic plants to grow.

Limnetic Zone

The open water area of a freshwater body, such as a lake, where sunlight penetrates deeply enough for photosynthesis to occur.