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denis-greek [22]
3 years ago
13

The fossil pictured above came from the St. Clair Site in Pennsylvania. The fossils are formed in black slate of the Pennsylvani

an Period, 300 million years ago. The fossils found at this site are comprised of ferns and trees. This fossil record for this time period in Pennsylvania indicates that the environment was a __________.
A) desert
B) deep ocean
C) shallow sea
D) thriving forest
Chemistry
2 answers:
netineya [11]3 years ago
6 0

Answer:

D) thriving forest

Explanation:

-A desert is a big area with sand that has no vegetation.

-An ocean is a large body of water.

-A shallow sea is a body of salt water that has little depth.

-A forest is an ecosystem that has a lot of vegetation.

According to the definitions and considering that the fossils found are comprised of ferns and trees, the answer is that the environment was a thriving forest.

Andre45 [30]3 years ago
5 0

Answer:

The answer is D)

Explanation:

Clue Words: Ferns and trees.

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The nuclear fuel used in a nuclear reactor needs to have a higher concentration of the U 235 isotope than that which exists in natural uranium ore. U235 when concentrated (or "enriched") is fissionable in light-water reactors (the most common reactor design in the USA).

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Identify the correct coefificients to balance it<br> -C3H8+O2 to -CO2 +-H2O
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{\rm 1\; C_3H_8} + {\rm 5\; O_2} \to {3\; \rm CO_2} + {4\; \rm H_2O}.

Explanation:

{\rm ?\; C_3H_8} + {\rm ?\; O_2} \to {?\; \rm CO_2} + {?\; \rm H_2O}.

Among the four species in this reaction, \rm C_3H_8 is species with the largest number of atoms per molecule. Assume that the coefficient of this compound is 1.

{\rm 1\; C_3H_8} + {\rm ?\; O_2} \to {?\; \rm CO_2} + {?\; \rm H_2O}.

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  • \rm O: not found yet.

By the conservation of atoms, the number of atoms on the right-hand side of the reaction should match those on the left-hand side. In this reaction, \rm CO_2 is the only product with carbon atoms, whereas \rm H_2O is the only product with hydrogen atoms. These 3 carbon atoms and 8 hydrogen atoms would correspond to:

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{\rm 1\; C_3H_8} + {\rm ?\; O_2} \to {3\; \rm CO_2} + {4\; \rm H_2O}.

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  • 5 \rm O_2 molecules.

{\rm 1\; C_3H_8} + {\rm 5\; O_2} \to {3\; \rm CO_2} + {4\; \rm H_2O}.

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