Answer the following question given this paragraph: Weathering changes solid rock into pieces. These pieces are called sediments. Sediments are described in the chapter Earth's Materials and Crust . Sediments are different sizes of rock particles. Boulders are sediments; so is gravel. At the other end, silt and clay are also sediments. Weathering may also cause the minerals at the Earth's surface to change form. The new minerals that form are stable at the Earth's surface. There are two types of weathering, mechanical and chemical. These are discussed in the next two concepts. Q: Over time, what changes solid rock into pieces? Choices: - metamorphosis - creep - leaching - weathering A:
weathering
Answer the following question given this paragraph: Today, these ideas about electrons are represented by the electron cloud model. The electron cloud is an area around the nucleus where electrons are likely to be. Figure below shows an electron cloud model for a helium atom. Q: What is the area around the nucleus of an atom where electrons are likely to be, called? Choices: - electron wave - electron membrane - electron pocket - electron cloud A:
electron cloud
Q: Answer the following question given this paragraph: The sliding-and-shortening process occurs all along many myofibrils and in many muscle fibers. It causes the muscle fibers to shorten and the muscle to contract. Q: What part of the muscle fibers cause shortening and contraction? Choices: - fasciae - pores - collagen - myofibrils A:
A: myofibrils
Question: Answer the following question given this paragraph: Because the organs of the integumentary system are external to the body, you may think of them as little more than "accessories," like clothing or jewelry. But the organs of the integumentary system serve important biological functions. They provide a protective covering for the body and help the body maintain homeostasis. Q: What provides a protective covering for the body and helps maintain homeostasis? Choices: - unadorned system - endorcrine system - lysogenic system - integumentary system A:
Answer: integumentary system
*Question*
Answer the following question given this paragraph: Look at the Figure below of water (H 2 O) and hydrogen peroxide (H 2 O 2 ), and read about these two compounds. Both compounds consist of hydrogen and oxygen, but they have different ratios of the two elements. As a result, water and hydrogen peroxide are different compounds with different properties. If you've ever used hydrogen peroxide to disinfect a cut, then you know that it is very different from water!. Q: What elements do water and hydrogen peroxide consist of? Choices: - carbon and oxygen - calcium and oxygen - hydrogen and helium - hydrogen and oxygen A:
**Answer**
hydrogen and oxygen
Answer the following question given this paragraph: Most aquatic organisms do not have to deal with extremes of temperature or moisture. Instead, their main limiting factors are the availability of sunlight and the concentration of dissolved oxygen and nutrients in the water. Q: Besides the concentration of dissolve oxygen and nutrients in the water, what other factor limits aquatic organisms? Choices: - rainfall - temperature - lake size - availability of sunlight A:
availability of sunlight