Answer:
D. Fossils of the Cambrian Period
Explanation:
The Cambrian Period (541–485.4 million years) is the period known for the explosion of life on Earth, when all the major phyla of multicellular organisms originated, and almost all the groups we find today, in a period of time geologically short.
The primitive faunas of this period had numerous morphological patterns, an immense variety of species, mostly soft-bodied animals, and new ecological strategies such as predation, burying themselves deep in the sediment and building complex, branched tunnels. They also featured some relatively large skeletal animals, such as trilobites, brachiopods, and
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:
i have the same question. let me know what's the answer pls! I think it's d but im
not sure
Explanation:
<u>Answer:</u>
The three statements that support the idea that South America is a single cultural region are as below:
- In most Latin American countries, the majority of locals speak Spanish.
- The "Mardi Gras tradition" is celebrated with "grand parades" in Brazil, Colombia, Argentina and Uruguay.
- Many people in Argentina, Chile, Peru and Ecuador practice Roman Catholicism.
<u>Explanation:</u>
- Countries like Argentina, Bolivia, Chile, Colombia, Ecuador, Paraguay, Peru, Uruguay, and Venezuela are Spanish speaking countries.
- The festival of El Carnaval is celebrated in most South American countries.
- The tradition of Mardi Gras is a part of El Carnaval. 69% of the total "South American population" practices Roman Catholicism.
