Answer the following question given this paragraph: No doubt you've seen this happen. Droplets of water fall into a body of water, and concentric circles spread out through the water around the droplets. The concentric circles are waves moving through the water. Q: Concentric circles that spread out through the water around the droplets are actually types of what moving through the water? Choices: - winds - troughs - lines - waves A:
waves
(Question)
Answer the following question given this paragraph: Photochemical smog consists mainly of ozone (O 3 ). The ozone in smog is the same compound as the ozone in the ozone layer,(O 3 ). But ozone in smog is found near the ground. Figure below shows how it forms. When nitrogen oxides and VOCs are heated by the Sun, they lose oxygen atoms. The oxygen atoms combine with molecules of oxygen to form ozone. Smog ozone is harmful to humans and other living things. Q: What dangerous oxygen compound is found in ground level smog? Choices: - argon - sulfur dioxide - neon - ozone A:
(Answer)
ozone
Ques: Answer the following question given this paragraph: Weathering changes solid rock into sediments. Sediments are different sizes of rock particles. Boulders are sediments; so is gravel. At the other end, silt and clay are also sediments. Weathering causes rocks at the Earth's surface to change form. The new minerals that form are stable at the Earth's surface. Q: Which process causes rocks at the earth's surface to change form? Choices: - bleaching - remodeling - eroding - weathering A:
Ans: weathering
(Q).
Answer the following question given this paragraph: Chemical weathering is different than mechanical weathering. The minerals in the rock change. The rock changes composition and becomes a different type of rock. Most minerals form at high pressure or high temperatures deep within Earth. But at Earth's surface, temperatures and pressures are much lower. Minerals that were stable deeper in the crust are not stable at the surface. That's why chemical weathering happens. Minerals that formed at higher temperature and pressure change into minerals that are stable at the surface. Chemical weathering is important. It starts the process of changing solid rock into soil. We need soil to grow food and create other materials we need. Chemical weathering works through chemical reactions that change the rock. Q: What type of weathering causes the minerals in a rock to change? Choices: - toxic - natural - artificial - chemical A:
(A).
chemical
Ques:Answer the following question given this paragraph: Absorption of light by a hydrogen atom. (a) When a hydrogen atom absorbs a photon of light, an electron is excited to an orbit that has a higher energy and larger value of n. (b) Images of the emission and absorption spectra of hydrogen are shown here. Emission and absorption spectra form the basis of spectroscopy, which uses spectra to provide information about the structure and the composition of a substance or an object. In particular, astronomers use emission and absorption spectra to determine the composition of stars and interstellar matter. As an example, consider the spectrum of sunlight shown in Figure 6.14 "The Visible Spectrum of Sunlight". Because the sun is very hot, the light it emits is in. Q: What are scientists able to determine about stars using emission and absorption spectra? Choices: - shape - size - distance - composition A:

Ans:composition
Ques:Answer the following question given this paragraph: A food chain represents a single pathway by which energy and matter flow through an ecosystem. An example is shown in Figure below . Food chains are generally simpler than what really happens in nature. Most organisms consumeand are consumed bymore than one species. Q: A single, often oversimplified, path through which energy and matter flow through an ecosystem is also known as what? Choices: - the chain - fuel chain - life cycle - food chain A:

Ans:
food chain