1. An adjustment that gives clear vision He turned his head almost upside down to get a more acute focus on her

2. The epicenter is the point on the earth's surface vertically above the hypocenter (or focus), point in the crust where a seismic rupture begins.

3. The focus is the place inside Earth's crust where an earthquake originates. The point on the Earth's surface directly above the focus is the epicenter.

Explanation:

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