Choose the best answer to the following: The crystals that make up minerals are composed of (a) atoms with a definite geometrical arrangement. (b) molecules that perpetually move. (c) X-ray patterns. (d) three-dimensional chessboards.

Where did Earth's water come from?

Uranium-238 (U-238) has a​ half-life of 4.5 billion years. Geologists find a rock containing a mixture of​ U-238 and​ lead, and determine that 74​% of the original​ U-238 remains; the other 26​% has decayed into lead. How old is the​ rock? ___billion years old

1 Application: x E Jennifer Petit-Frere - Law of Cos x docs.google.com/document/d/11eRA2Yhgqqek6Eaa3kmwU3gNWbg2ATqzFOPO-5GfSfl/edit Petit-Frere - Law of Cosines and Applications Wsht-3/3/21 O View Insert Format Tools Add-ons Help Last edit was 2 hours ago 100% Heading 1 Arial 三, 三三,m▼三! 12 BIUA 2 3 4. 5 Law of Cosines and Applications Wsht-3/3/21 1. What is the length of the missing side if the two known sides of a triangle are 3 feet and 6 feet and the angle opposite the missing side is 60 degrees? A. 4.895 feet B. 5.196 feet C. 5.895 feet D. 6.241 feet 2. A ladder is 6 feet from a building. The building is 20 feet tall. The angle opposite the ladder is 90. How tall is the ladder? A. 23.00 feet B. 24.00 feet C. 20.88 feet D. 31.24 feet SAMSUNG

You want to use radiometric dating to determine the age of a specimen. You use Isotope Z, which has a half-life of 645 years. You measure your sample and find that 1/16 of the original amount of Isotope Z is present. How old is the sample?