Answer:
F Anthracite (the hardest coal)
Explanation:
Coal is a sedimentary rock that is formed from plant materials. These plant materials must have been trapped and compacted in an environment where they are not able decay. Such an environment is a swamp.
The first grade of coal that forms initially in such an environment is called PEAT. Peat is soft coal that still contains some plant materials. It has a high moisture content and the amount of carbon is still quite low.
With increasing pressure and compaction, PEAT grades into LIGNITE which has more carbon atoms in it. Lignite is more combustible although it is quite soft too. Lignite grades into SUB-BITUMINOUS coal and then BITUMIOUS coal.
The highest grade of coal is ANTHRACITE which is a hard coal. It has very little moisture content and rich carbon percentage in it. Anthracite yields more energy compared to other forms of coal. Anthracite is basically coal that forms at the greastest pressure. Beyond this pressure, a metamorphic transformation occurs and the coals changes to graphite.
Based on increasing pressure:
PEAT< LIGNITE< BITUMINOUS COAL < ANTHRACITE
Since Ethiopia’s economy is primarily based on agriculture, I would think it would be commercial farming.
Answer:
<em>Captain James Cook’s first exploration was to Tahiti to observe the transit of Venus in 1969.
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Explanation:
James Cook was born in Yorkshire in 1728 to a farm labourer. He sailed for several years in the North Sea, Irish Sea, Baltic Sea. He volunteered many services with which he as appointed as an able seaman. He also worked as rank master, surveyor.
In 1969, he was promoted as a rank of Lieutenant and was instructed to sail to Tahiti to observe the transit of Venus in 1969. This expedition was to ascertain whether there is an existence in the Southern latitudes of the Pacific Ocean.
<span>They move from west to east by the Prevailing Westerlies and Jet Streams</span>
The answer is : hutu, tutsi, interhambwe. The 3 groups that helped convoy reach the Tutsi refugee camp are hutu, tutsi, interhambwe.
