The correct answers are:
- Only about 3 percent of Earth's water is freshwater;
The amount of freshwater, out of all the water on the planet, is very low, only around 3%. Considering how much we spend of it, and how much we are polluting it, it is alarming, and urgent measures have to be taken in order to preserve this essential life element.
- About 75 percent of the freshwater on Earth is frozen in ice sheets;
Not just being only 3% out of the total water reserves on the planet, the majority of the freshwater is not actually usable, as around 75% (68.7% by the newest data) of it is actually frozen. The ice sheets on the poles, as well as the glaciers, are holding most of the freshwater in them, and even if they melt, the water will become saline and not usable because it will mix with the ocean waters.
You should be able to press delete
Answer:
The 150 g Al will reach a higher temperature.
Explanation:
- The amount of heat added to a substance (Q) can be calculated from the relation:
<em>Q = m.c.ΔT.</em>
where, Q is the amount of heat added,
m is the mass of the substance,
c is the specific heat of the substance,
ΔT is the temperature difference (final T - initial T).
Since, Q and c is constant, ΔT will depend only on the mass of the substance (m).
∵ ΔT is inversely proportional to the mass of the substance.
<em>∴ The piece with the lowest mass (150.0 g) will reach a higher temperature than that of a higher mass (250.0 g).</em>
<em>So, the right choice is: The 150 g Al will reach a higher temperature.</em>
Answer:
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Explanation:
B and D both help the plant :) shsjsjf
