Glassy, pearly, silky and greasy are terms that refer to a mineral's ________.

Streak
Luster
Hardness


Luster

Physics & Space Science

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The fundamental force that is the principal cause of what we experience as frictional forces is:

A. gravitational force B. electromagnetic force C. weak force D. strong force

Physics & Space Science

In hot-work, a metal is deformed at temperatures that are either above the ___________temperature, or above 50 % of the absolute melting temperature.

Fill in the blank(s) with the appropriate word(s).

Physics & Space Science

Describe some of the difficulties people have in making good longterm predictions

What will be an ideal response?

Physics & Space Science

The wavelength of ________ is longer than the wavelength of yellow light.

A. blue-green B. yellow C. green D. red

Physics & Space Science