Q: Q: What device detects and measuresee earthquake waves? Read this paragraph and choose the correct option from the provided answers: Although the idea that Earth is a magnet is centuries old, the discovery of why Earth is a magnet is a relatively new. In the early 1900s, scientists started using seismographic data to learn about Earth's inner structure. A seismograph detects and measure earthquake waves. Evidence from earthquakes showed that Earth has a solid inner core and a liquid outer core (see the Figure below ). The outer core consists of molten metals, mainly iron and nickel. Scientists think that Earth's magnetic field is generated by the movement of charged particles through these molten metals in the outer core. The particles move as Earth spins on its axis. The video at the URL below takes a closer look at how this occurs. Choices: - stenograph - polygraph - sphygmomanometer - seismograph A:
A: seismograph

Q: Q: What causes a small scrap of paper placed on top of the water droplet to float , although the object is denser (heavier) than the water? Read this paragraph and choose the correct option from the provided answers: a small scrap of paper onto a droplet of water, the paper floats on top of the water droplet, although the object is denser (heavier) than the water. This occurs because of the surface tension that is created by the water molecules. Cohesion and surface tension keep the water molecules intact and the item floating on the top. It is even possible to "float" a steel needle on top of a glass of water if you place it gently, without breaking the surface tension (Figure 2.11). Choices: - diffusion - transfusion - van der waals force - surface tension A:
A: surface tension

Q: Q: What do you call the point at which the entire weight of a body may be considered to be concentrated? Read this paragraph and choose the correct option from the provided answers: Every object has a center of gravity . The center of gravity is the point at which the entire weight of a body may be considered to be concentrated; if supported at this point, the body would remain in equilibrium in any position. For example, if we were discussing a 12-inch ruler, the center of gravity for the ruler would be at the center of the 6-inch line. You could put your finger directly under the 6-inch line to hold the ruler and it would not fall either left or right. If you placed your finger underneath any other place on the ruler, it would fall off to one side or the other. Choices: - center of earth - complex of gravity - direction of gravity - center of gravity A:
A: center of gravity

Q: Q: Preserved remains or traces of organisms that lived in the past are known as what? Read this paragraph and choose the correct option from the provided answers: Fossils are preserved remains or traces of organisms that lived in the past. Most preserved remains are hard parts, such as teeth, bones, or shells. Examples of these kinds of fossils are pictured in Figure below . Preserved traces can include footprints, burrows, or even wastes. Examples of trace fossils are also shown in Figure below . Choices: - archives - deposits - skulls - fossils A:
A: fossils