Answer the following question given this paragraph: Occurrence, Preparation, and Compounds of Boron and Silicon Boron constitutes less than 0.001% by weight of the earth's crust. In nature, it only occurs in compounds with oxygen. Boron is widely distributed in volcanic regions as boric acid, B(OH)3, and in dry lake regions, including the desert areas of California, as borates and salts of boron oxyacids, such as borax, Na2B4O710H2O. Elemental boron is chemically inert at room temperature, reacting with only fluorine and oxygen to form boron trifluoride, BF3, and boric oxide, B2O3, respectively. At higher temperatures, boron reacts with all nonmetals, except tellurium and the noble gases, and with nearly all metals; it oxidizes to B2O3 when heated with concentrated nitric or sulfuric acid. Boron does not react with nonoxidizing acids. Many boron compounds react readily with water to give boric acid, B(OH)3 (sometimes written as H3BO3). Reduction of boric oxide with magnesium powder forms boron (9598.5% pure) as a brown, amorphous powder: B 2 O 3(s) + 3Mg(s) 2B(s) + 3MgO(s) An amorphous substance is a material that appears to be a solid, but does not have a long-range order like a true solid. Treatment with hydrochloric acid removes the magnesium oxide. Further purification of the boron begins with conversion of the impure boron into boron trichloride. The next step is to heat a mixture of boron trichloride and hydrogen: 1500 C. Q: Boron only occurs naturally in compounds with what element? A:
OPTIONS:
- helium
- nitrogen
- carbon
- oxygen
oxygen

Answer the following question given this paragraph: Bacteria are the most diverse and abundant group of organisms on Earth. They live in almost all environments. They are found in the ocean, the soil, and the intestines of animals. They are even found in rocks deep below Earth's surface. Any surface that has not been sterilized is likely to be covered with bacteria. The total number of bacteria in the world is amazing. It's estimated to be 5 10 30 , or five million trillion. You have more bacteria in and on your body than you have body cells!. Q: What is the most diverse and abundant group of organisms on earth, numbering in the millions of trillions? A:
OPTIONS:
- viruses
- pests
- pathogens
- bacteria

Answer: bacteria

Question: Answer the following question given this paragraph: Some landforms created by erosion are platforms, arches, and sea stacks. Q: Platforms, arches, and sea stacks are all landforms created by what? A:
OPTIONS:
- sediment
- volcanic activity
- debris
- erosion
Answer: erosion

input with options: Answer the following question given this paragraph: The central tendency of a sample can be represented by the mean, median, or mode. Q: What part of a sample can be represented by the mean, median, and mode? A:
OPTIONS:
- present tendency
- large tendency
- outer tendency
- central tendency
output: central tendency

Q: Answer the following question given this paragraph: Sunspots occur in pairs. Each is one side of a loop of the Sun's magnetic field on the Sun's surface. Sunspots come and go on an 11-year cycle. Q: In which way do sunspots occur? A:

OPTIONS:
- by themselves
- in fours
- in threes
- in pairs

A: in pairs

Answer the following question given this paragraph: Q: The symbol for each what is usually the first letter or two of its name? A:
OPTIONS:
- state
- property
- material
- element
element