Answer the following question given this paragraph: Most minerals are a combination of metal and other elements. The rocks that are taken from a mine are full of valuable minerals plus rock that isn't valuable. This is called waste rock. The valuable minerals must be separated from the waste rock. One way to do this is with a chemical reaction. Chemicals are added to the ores at very high temperatures. Q: The rocks that are taken from a mine are full of valuable minerals plus rock that isn't valuable. what is this rock called? Choices: - garbage rock - compost rock - empty rock - waste rock A:
waste rock
(Question)
Answer the following question given this paragraph: Such knowledge of the natural world is only part of what science is. Science is as much about doing as knowing. Science is a way of learning about the natural world that depends on evidence, reasoning, and repeated testing. Scientists explain the world based on their observations. If they develop new ideas about the way the world works, they set up ways to test these new ideas. Scientific knowledge keeps changing because scientists are always "doing science. ". Q: Scientists explain the world based on what? Choices: - changes - patterns - theories - observations A:
(Answer)
observations
Ques: Answer the following question given this paragraph: Bacteria called cyanobacteria are very important. They are bluish green in color (see Figure below ) because they contain chlorophyll. They make food through photosynthesis and release oxygen into the air. These bacteria were probably responsible for adding oxygen to the air on early Earth. This changed the planet's atmosphere. It also changed the direction of evolution. Ancient cyanobacteria also may have evolved into the chloroplasts of plant cells. Q: Cyanobacteria are bluish green in color because they contain what? Choices: - chloroplasts - microbial - carbonate - chlorophyll A:
Ans: chlorophyll
(Q).
Answer the following question given this paragraph: Many people have problems with their vision , or ability to see. Often, the problem is due to the shape of the eyes and how they focus light. Two of the most common vision problems are nearsightedness and farsightedness, which you can read about below. You may even have one of these vision problems yourself. Usually, the problems can be corrected with contact lenses or lenses in eyeglasses. In many people, they can also be corrected with laser surgery, which reshapes the outer layer of the eye. For a video about vision problems, go to this URL: http://www. youtube. com/watch?v=ekSGbXt4XdI. Q: What are the two most common vision problems? Choices: - colorblindness and farsightedness - glaucoma and nearsightedness - colorblindness and nearsightedness - nearsightedness and farsightedness A:
(A).
nearsightedness and farsightedness
Ques:Answer the following question given this paragraph: The structure of a neuron allows it to rapidly transmit nerve impulses to other cells. Q: The structure of a neuron allows it to rapidly transmit nerve impulses to other what? Choices: - muscles - limbs - proteins - cells A:

Ans:cells
Answer the following question given this paragraph: deep sea trenches : Trenches are found in the sea. Some are near the edges of continents. Trenches are found near chains of active volcanoes. An example is the line of the very deepest blue, off of western South America. Q: What kind of mountainous formation can often be found near trenches? Choices: - earthquakes - caves - craters - volcanoes A:
volcanoes