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
Answer:
Option (1)
Explanation:
A fjord is usually defined as a contrasting geological landform, which is typically a U-shaped valley, that is formed due to the movement of the glaciers. It is generally narrow and forms steep-sided cliffs on both the sides and is mostly connected to the seas. They have huge depth, sometimes reaches up to a depth of about 1300 m. The downward flowing glaciers pushes the terminal moraine and allows it to remain underwater at its entrance, resulting in shallow water at the fjord's neck, in comparison to the main body of the fjord that is located behind it.
Thus, the correct answer is option (1).
<span>the answer is pan-</span>Africanism
Answer:
To be the only country to do so
Answer:
D. the book is in equilibrium
Explanation:
The book does have the force of gravity exerted on it, but it is able to rest on the table because the force of gravity is countered by the force of the table pushing up on the book.
