The Mass Extinction at the End of the Ordovician Period

question 98

Multiple Choice

The mass extinction at the end of the Ordovician period was probably caused by

• A) the collision of Earth with a large meteorite.
• B) massive volcanic eruptions.
• C) massive glaciation on the southern continents and associated climate changes.
• D) the coming together of the continents to form Pangaea.
• E) changes in Earth's orbit.

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Definitions:

Dreaming

A series of thoughts, images, and sensations occurring in a person's mind during sleep.

Memory Consolidation

The process by which short-term memories are transformed into long-term memories.

Memory Errors

Mistakes or inaccuracies in the recall or recognition of information from memory, including forgetting, distortions, or fabrications.

Stimulants

Substances that increase activity in the central nervous system or the sympathetic nervous system, leading to increased alertness and physical activity.