Explanation:
Fossil fuels are important energy sources for our every day activities.
Formation of fossil fuels
Fossil fuels forms from the accumulation and burial of organisms in a basin of deposition. Instead of the organisms decaying, they preserve their carbon content. To be worthy of becoming fossil fuels, organisms must be buried in an environment where there is little to no oxygen to fast-track decomposition of the buried organic matter. Increase in temperature and pressure causes the organic matter to transform into fossil fuels.
How are they obtained
First, different fossil fuels have their extraction techniques because they occur in different physical state of matter.
For the solids e.g coal: exploration is carried out first and if a prospect is delineated, mining engineers design the best way to extract the coal from nature. Coal is usually found laid in sedimentary beds in nature. Top layers of sediments can be removed to extract the coal.
For fluids such as crude oil and natural gas, after a prospect is identified, a rig is usually constructed to extract the fluid and gas. The natural pressure allows for the fluids the rise within the drill used in extraction.
How are they used
Coal and gas are used to power electrical generating plants. They are used to heat steams which drives turbines and produce electricity.
Natural gas is used as a domestic fuel for cooking and so also coal.
When crude is processed a lot of product is obtained. Gasoline is used to power most internal combustion engines. Some chemicals useful for manufacturing plastics, drugs e.t.c are also derived from the processed crude.
Learn more:
Harnessing fossil fuel brainly.com/question/9231468
#learnwithBrainly
Answer:
Stage 1—High birth and death rates lead to slow population growth.
Stage 2—The death rate falls but the birth rate remains high, leading to faster population growth.
Stage 3—The birth rate starts to fall, so population growth starts to slow.
Stage 4—The birth rate reaches the same low level as the death rate, so population growth slows to zero.
Explanation:
Answer:
a. 0.7
b. 0.3
c. Yes
d. 90
Explanation:
As the random mating population was escaped from external evolutionary forces such as mutation, natural selection, and migration, the gene frequency will not change over time. The population will be at Hardy-Weinberg equilibrium throughout the time.
<u>As the number of sleepyheads (recessive trait) was 90 out of class of 1000 students at the start of course.</u>
<u />
q²=0.09 ∵ fraction of sleepyheads = 90/1000 = 0.09 denoted by q²
q that is the recessive gene frequency will be equal to 0.3 (by taking square root of P²
Hence, <em>allele frequency of a allele is 0.3</em>
<em></em>
As, frequency of dominant allele A is denoted by letter p and p+q=1
∴ p=0.7 As p=1-0.3
Hence,<em> allele frequency of A allele is 0.7</em>
<em></em>
Counting the probability of aa alleles (sleepyheads);
As a= 0.3
∴ aa= 0.3×0.3 = 0.09 (In terms of percentage, it is 9%)
To 0.09×1000= 90 or 9% of 1000 = 90
Hence, 90 students should be sleepyheads.
