Why are some motors painted black?
a)
black is a standard color code for motors.
b)
this prevents loss of heat from the motor.
c)
the motor is hotter than the surroundings and emits heat.
d)
the motor runs on heat energy and the black color absorbs heat from its surroundings.

Ageologist determines that a sample of a mineral cant be scratched by a steel nail but can be scratched by a masonry drill bit based on this information the sample mineral has to be softer than

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons

In the ocean why are the greatest amount of primary producers found in the epipelagic zone and how does that affect biodiversity