Answer:
Serendipity has been recently discovered in the Portage-du-Fort area, Pontiac Regional County Municipality, Quebec. Dark blue, often polysynthetic twinned on {011} and with no cleavage, serendipity crystals occur exclusively in a calc-silicate rock. Fine-grained cathedral serendipity, sometimes poikiloblastic, occurs with aluminous diopside. Less commonly, serendipity may form decussate masses in the same rock type. Serendipity is biaxial negative, with indices of refraction α 1.685(2), β 1.700(2), and γ 1.712(2); 2Vmeas. = 93.6(4)°, 2Vcalc. = 91°. Orientation matrix is X ^ c = +20.5°, Y ^ b = -42.6°, and Z ^ a = -24.6°. Dispersion is strong, r 蠐 v, and there is no pleochroism. Serendipity is triclinic, space group P1¯ with cell parameters refined from an X-ray powder-diffraction pattern: a 10.035(2), b 10.423(3), c 8.648 (2) Å, α 106.47(3)°, β 95.91(2)°, γ 124.46(2)°, V 674.3(2) Å3. The seven strongest lines of the X-ray powder diffraction pattern [d in Å(I)(hill)] are: 3.328(45)(230), 3.029 (96)(012, 021, 1 22), 2.854(96)(01¯3, 03¯1, 120), 2.689(29)(31¯1), 2.604(95)(030), 2.469(100)(2¯1¯3, 033), and 2.357(28)(22¯3, 23¯3). The crystal structure determination refined to R = 2.1% for 3877 unique reflections. The borosilicate structure, a member of the aenigmatite-rhenate group, is composed of layers parallel to (011). Layers of tetrahedral chains cross-linked by octahedral polyhedral alternate with layers of octahedral chains cross-linked by square antiprism polyhedral sheets. Tetrahedral and octahedral polyhedral are partially ordered and site assignments were determined. All cation sites are disordered to some degree.
Explanation:
Answer:
The best option to modify this sentence is: change then to than.
Explanation:
There is no mistake in the way the sentence is punctuated. Also, "calm" is an adjective referring to lake, so it does not need to be changed. "Calmly" is an adverb, and would be used differently.
However, there is a misspelling in "then". The correct word is "than", which a part of the expression "would rather... than...", which expresses preference. That is the only problem with the sentence. The correct form is:
If I were a duck, I would rather swim in a calm lake than a fast moving stream.
Another example with "would rather... than..." would be:
She said she would much rather not buy it at all than borrow the money to do it.
Answer:
In January 1608, Jamestown Colony suffered a great misfortune: arms, shelter, clothing, and food were all destroyed by fire.
Explanation:
<u>Comma is used to separate parts of sentence or to separate items within a sentence. </u>
All choices have correct use of comma.
<u>Colon is a punctuation mark used in the middle of a sentence to explain the first half of the sentence. It may provide explanation, bring examples, or gives a list for the first half. </u>
Here, the second half of the sentence provides a list of misfortunes.
So, this sentence is correct regarding punctuation.
In January 1608, Jamestown Colony suffered a great misfortune: arms, shelter, clothing, and food were all destroyed by fire.
