What is the approximate bond angle around the indicated carbon atom? 
Definitions:
Half-Lives
The time required for half the atoms in a sample of a radioactive substance to decay into a more stable form.
Granite Unit
A large body of intrusive igneous rock characterized by a composition of quartz, feldspar, and mica, commonly forming part of the continental crust.
Half-Lives
The time required for half the atoms in a radioactive substance to decay, a measure of the rate at which radioactive materials break down.
Dike Unit
A geological structure consisting of a vertical or steeply-dipping sheet of rock that has intruded into a fracture.
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