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17. Conservation is generally associated with the protection of natural resources, while preservation is associated with the protection of buildings, objects, and landscapes.

18. Look at it closely on all visible sides to see how it reflects light.

Test its hardness.

Identify its cleavage or fracture.

Name its luster.

Evaluate any other physical properties necessary to determine the mineral's identity.

19. Reduce, reuse, and recycle.

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2018 means 2018 ce or common era

there have been other eras too including bce, which included way more years.

they thoght they were going to nuke each other