<span>If the grasses on a 100-hectare area of grassland grow at an average rate of 1 cm/day, the average volume of grass that is added to the grassland each day is 10,000 m3
</span><span>If the density of the grasses that grow in the grassland average 400 kg/m3, the NPP is approximately 4000 g/m2/day or 1460000 g/m2/year
Equations:
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100 hectare (x) 10,000 m2/hectare = 1(x)106 m2 (x) 0.01 m/day =</span></span>
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10,000 m3/day (x) 400 kg/m3 (x) 1000 g/1 kg = 4 (x) 109 g/day / 1 (x) 106 m2 =</span></span>
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4000 g/m2<span>/day (x) 365 day/year = </span>
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Elements emit colours when heated because electrons in atoms can have only certain allowed energies.Heating an atom excites its electrons and they jump to higher energy levels. When the electrons return to lower energy levels, they emit energy in the form of light. Every element has a different number of electrons and a different set of energy levels. Thus, each element emits its own set of colours. See, for example, mercury and neon above. Those colours are as distinctive to each element as fingerprints are to people.
Answer:
Farrah: 5 pieces of (3/4) blue yarn, 1 piece of (1 3/5) red yarn, and 1 piece of (2 1/2) green yard
Alice: 3 pieces of (3/4) blue yarn, 2 pieces of (1 3/5) red yarn, and 1 piece of (2 1/2) green yard
Pia: 9 pieces of (3/4) blue yarn
Explanation: Farrah: (0.75*5)+1 3/5+2.5 = 7.85 ft
Alice: (0.75*3)+(1 3/5*2)+2.5= 7.95 ft
Pia: 0.75*9 = 6.75 ft
D is the answer your looking for
