Which of the following minerals has greasy luster, no cleavage, and a white streak?
magnetite
pyroxene
talc
mica

streak colors of common minerals

andalusite white or colorless (hardness is about the same as the streak plate).

nephrite colorless (harder than the streak plate).

olivine white or colorless (about the same hardness as the streak plate). often sheds tiny granules instead of a powder.

orthoclase white.

explanation:

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.

where is the circuit diagram ?