input: OPTIONS:
- radius
- electron shell
- epidermis
- nucleus Now, answer this question: Answer the following question given this paragraph: Unlike protons and neutrons, which are located inside the nucleus at the center of the atom, electrons are found outside the nucleus. Because opposite electric charges attract each other, negative electrons are attracted to the positive nucleus. This force of attraction keeps electrons constantly moving through the otherwise empty space around the nucleus. The Figure below is a common way to represent the structure of an atom. It shows the electron as a particle orbiting the nucleus, similar to the way that planets orbit the sun. Q: Where are protons and neutrons located? A:
A:
output: nucleus

Answer the following question given this paragraph: Mountain streams may erode waterfalls. As shown in Figure below , a waterfall forms where a stream flows from an area of harder to softer rock. The water erodes the softer rock faster than the harder rock. This causes the stream bed to drop down, like a step, creating a waterfall. As erosion continues, the waterfall gradually moves upstream. Q: When a stream flows from a hard to soft rock area, what is often formed? A:

OPTIONS:
- a lake
- a river
- a riverbank
- a waterfall

Answer: a waterfall

Problem: OPTIONS:
- the macula
- the iris
- the cornea
- the pupil
Q: Answer the following question given this paragraph: The pupil is an opening in the front of the eye. It looks black because it doesn't reflect any light. It allows light to enter the eye. The pupil automatically gets bigger or smaller to let more or less light in as needed. Q: What is the opening in the front of the eye? A:
Answer: the pupil

Problem:OPTIONS:
- notation
- title
- shorthand
- symbol

Answer the following question given this paragraph: Note Today, new elements are usually named after famous scientists. The names of the elements can be cumbersome to write in full, especially when combined to form the names of compounds. Therefore, each element name is abbreviated as a one- or two-letter chemical symbol. By convention, the first letter of a chemical symbol is a capital letter, while the second letter (if there is one) is a lowercase letter. The first letter of the symbol is usually the first letter of the element's name, while the second letter is some other letter from the name. Some elements have symbols that derive from earlier, mostly Latin names, so the symbols may not contain any letters from the English name. Table 2.3 "Element Names and Symbols" lists the names and symbols of some of the most familiar elements. Table 2.3 Element Names and Symbols. Q: Today, new elements are usually named after famous scientists. the names of the elements can be cumbersome to write in full, especially when combined to form the names of compounds. therefore, each element name is abbreviated as a one- or two-letter chemical this? A:
****
A: symbol

Answer the following question given this paragraph: All matter consists of atoms, which cannot be further subdivided into smaller particles. Q: What does all matter consist of? A:
OPTIONS:
- carbon
- helium
- oxygen
- atoms
atoms

Answer the following question given this paragraph: Although renewable, soil takes a very long to formup to hundreds of millions of years. So, for human purposes, soil is a nonrenewable resource. It is also constantly depleted of nutrients through careless use and eroded by wind and water. For example, misuse of soil caused a huge amount of it to simply blow away in the 1930s during the Dust Bowl (see Figure below ). Soil must be used wisely to preserve it for the future. Conservation practices include contour plowing and terracing. Both reduce soil erosion. Soil also must be protected from toxic wastes. Q: What resource is considered nonrewable for human purposes, because it takes so long to form and is depleted by farming and other activities? A:
OPTIONS:
- water
- acid
- sunshine
- soil

Answer:
soil