The amount of heat needed to melt the block of lead is 
Explanation:
The amount of heat needed to melt a solid substance already at its melting point is given by the equation
where
m is the mass of the substance
is the specific latent heat of fusion
In this problem, we have a block of lead already at its melting point, 
. Its mass is
m = 200 g = 0.2 kg
and its specific latent heat of fusion is
Therefore, the amount of heat needed for the block to completely melt is
Learn more about specific heat:
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<span>The angle at which the light ray strikes the mirror equals the angle at which it reflects. Its the first law of reflection.</span>
The best answer is b) increased turbidity from erosion.
Nonpoint source pollution generally happens as a result of many systems interacting, and is not directly attributed to one event or pollutant. Generally, natural environmental systems participate in pollution of this kind, regardless of whether or not human activity was a factor. Examples include water runoff, or erosion.
The other pollutants listed have a direct cause and direct effect, the animal waste goes directly from the animals to the ground they live on, the car shop directly sumps the oil on the ground, and the oil tank leaks directly into the earth. Erosion causing turbidity is a less direct form of pollution, and is due to the synthesis of several natural phenomena<span />
Answer:
D
Explanation:
Stomata take in carbon dioxide (i think they realease oxygen too), Phloem transports the glucose throughout the plant, Xylem transports the water and minerals from the roots. If you want me to explain more I can
Closed is the correct answer :)
