Answer:
a. It always points perpendicular to the contact surface.
Explanation:
"Normal" means perpendicular. Normal forces are always perpendicular to the contact surface.
Answer:
The crystal structure of topaz is the Orthorhombic crystal system
Explanation:
Because it is a Dipyramid and the Orthorhombic crystal system consists of prisms and dypiramids
Answer:
A lever is a rigid bar which moves freely about a fixed point called fulcrum.
Long lasting is thought important for sustainable development because it suggest the target of economic and sustainable development without displacing means and resources of the earth.
Explanation:
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