The Oldest Rocks Found on the Earth's Surface Date Back

question 17

Multiple Choice

The oldest rocks found on the Earth's surface date back about billion years.

• A) one
• B) two
• C) three
• D) four
• E) four and a half

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Definitions:

Sciatica

Inflammation and pain along the sciatic nerve felt at the back of the thigh running down the inside of the leg.

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A chronic autoimmune disease affecting the central nervous system, leading to varying levels of physical and cognitive impairments.

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A neurological disorder characterized by repetitive, involuntary movements and vocalizations called tics.

Facial Tic

Involuntary, repetitive movements or spasms of the face muscles.