Usually, sound needs a medium to travel through, like a vacuum for example.
Light does not need a medium to travel, and since air is considered a medium, light is not dependent on that.
On the other hand, sound needs a medium to travel through, and outer space doesn't contain space, therefore, no sound.
Properties to identify a mineral:
Color
Luster
Streak
Hardness
Cleavage
(There appears to be 8 things you need to fill in but I only know this much)
What will scratch Quartz:
Topaz
Corundum
Diamond
sorry I only knew a few of the answers, hope I still helped
Answer:
Explanation:
Given
mass of object is m
Mass of planet is M
radius of planet is R
Total Energy associated with mass m at a height h above planet is Gravitational Potential Energy which is given by
When it falls on earth with some velocity v
=Kinetic Energy+Potential Energy
As Energy is conserved therefore
Surely it is their shell that protects them. They hide beneath it
Treatment water from the plant would affects the communities present in the downstream of the river.
Answer: Option (a)
<u>Explanation:</u>
Wastewater treatment plant is a process used to treat the water that flows from the rivers, streams, and lakes.This plant removes the dust, sand, sediments present in the river water.
When this treated water is released into the downriver stream, it affects the health of aquatic organisms present in that stream.Use of chemicals in treating the wastewater may cause genetic problems to the communities present in that region.
It also causes air pollution and more energy is needed for the treatment process and thus affects the ecosystem.
