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The mantle lies below Earth’s crust and extends to the outer core. The lithosphere includes both the crust and the rigid upper mantle, while the core lies deeper. The atmosphere surrounds Earth but is not a geological layer. GS questions often check knowledge of Earth science basics.

Subtract 9: 2x = 16 → x = 8. Correct = C, not A. MK linear equations are straightforward but require careful subtraction and division.

Staple guns are designed to fasten materials with staples. Mallets drive chisels, ratchets tighten bolts, planes smooth wood. SI often tests common fastening tools.

The pancreas secretes insulin from specialized beta cells in the islets of Langerhans. Insulin regulates blood sugar by enabling glucose uptake by cells. The liver stores and releases glucose, kidneys filter blood, and the stomach digests food but doesn’t produce insulin. GS questions often test basic organ function and hormones.

Screws can be tightened and removed repeatedly without destroying the joint. Rivets are permanent, nails and staples can be removed but often damage material. SI questions often test permanence vs reusability of fasteners.