Soil is a mixture of minerals, organic matter, water and air. The minerals come from bits of broken-down rock. Organic matter is material that is alive or used to be alive. It includes leaves, twigs, bugs and many microscopic, or tiny, organisms like bacteria and fungi. In fact, there are more microorganisms in a handful of soil than there are people on the planet. Soil is needed for life to exist on Earth. It contains many nutrients that help plants grow. Then the plants provide nutrients that help animals grow. Which of these is not a natural part of soil?

no sign of dia of fuel cell

c) up

hope this

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

the temperature in kelvin of 2.0 dm3 of an ideal gas is doubled and its pressure is increased by a factor of four. what is the final volume of the gas