1. A
2. D
3. D
I hope this helped ^_^
Sentences are the building blocks used to construct written accounts. They are complete statements. Punctuation shows how the sentence should be read and makes the meaning clear. Every sentence should include at least a capital letter at the start, and a full stop, exclamation mark or question mark at the end.
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:
Explanation:
THE AMAZON ECHO can seem like your best friend---until it betrays you. That's because this device is different from anything else in your house. Alexa, the voice assistant that powers Echo and more, is always listening, sending what you say after using a "wake" word to Amazon's servers. Of course, Echo isn't the only voice-assistant speaker on the market, but it sits in millions of homes, and Alexa is headed to devices from companies like Ford, Dish, Samsung, and Whirlpool.
