What did ancient people think of lunar eclipses

The ancient Chinese believed that solar eclipses occur when a celestial dragon devours the Sun. They also believed that the same dragon attacks the Moon during lunar eclipses. It was a tradition in ancient China to bang drums and pots and make loud noise during eclipses to frighten that dragon away.

Explanation:

What happened to the ruler when you suddenly released it

that tool would be a compass

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).