Q: Similar to the coil on a stove, changes in what reflect an increase in the temperature of a star? Read this paragraph and choose the correct option from the provided answers: Think about the coil of an electric stove as it heats up. The coil changes in color as its temperature rises. When you first turn on the heat, the coil looks black. The air a few inches above the coil begins to feel warm. As the coil gets hotter, it starts to glow a dull red. As it gets even hotter, it becomes a brighter red. Next it turns orange. If it gets extremely hot, it might look yellow-white, or even blue-white. Like a coil on a stove, a star's color is determined by the temperature of the star's surface. Relatively cool stars are red. Warmer stars are orange or yellow. Extremely hot stars are blue or blue-white. Choices: - texture - direction - rotation - color A:
color

Q: Screws move objects to a higher elevation by increasing what? Read this paragraph and choose the correct option from the provided answers: The spiral staircase in Figure below also contains an inclined plane. Do you see it? The stairs that wrap around the inside of the walls make up the inclined plane. The spiral staircase is an example of a screw. A screw is a simple machine that consists of an inclined plane wrapped around a cylinder or cone. No doubt you are familiar with screws like the wood screw in Figure below . The screw top of the container in the figure is another example. Screws move objects to a higher elevation (or greater depth) by increasing the force applied. Choices: - velocity - torque - kinetic energy - force applied A:
force applied

Q: Q: The vast majority of what phenomena occurs along one of three types of plate boundaries? Read this paragraph and choose the correct option from the provided answers: Nearly 95% of all earthquakes take place along one of the three types of plate boundaries. As you learned in the Plate Tectonics chapter, scientists use the location of earthquakes to draw plate boundaries. Choices: - tornados - hurricane - volcanoes - earthquake A:
A: earthquake

Question: Q: Some atoms are more stable when they gain or lose an electron and form what? Read this paragraph and choose the correct option from the provided answers: Ions and Ionic Bonds Some atoms are more stable when they gain or lose an electron (or possibly two) and form ions. This fills their outermost electron shell and makes them energetically more stable. Because the number of electrons does not equal the number of protons, each ion has a net charge. Cations are positive ions that are formed by losing electrons. Negative ions are formed by gaining electrons and are called anions. Anions are designated by their elemental name being altered to end in "-ide": the anion of chlorine is called chloride, and the anion of sulfur is called sulfide, for example. This movement of electrons from one element to another is referred to as electron transfer. As Figure 2.11 illustrates, sodium (Na) only has one electron in its outer electron shell. It takes less energy for sodium to donate that one electron than it does to accept seven more electrons to fill the outer shell. If sodium loses an electron, it now has 11 protons, 11 neutrons, and only 10 electrons, leaving it with an overall charge of +1. It is now referred to as a sodium ion. Chlorine (Cl) in its lowest energy state (called the ground state) has seven electrons in its outer shell. Again, it is more energy-efficient for chlorine to gain one electron than to lose seven. Therefore, it tends to gain an electron to create an ion with 17 protons, 17 neutrons, and 18 electrons, giving it a net negative (1) charge. It is now referred to as a chloride ion. In this example, sodium will donate its one electron to empty its shell, and chlorine will accept that electron to fill its shell. Both ions now satisfy the octet rule and have complete outermost shells. Because the number of electrons is no longer equal to the number of protons, each is now an ion and has a +1 (sodium cation) or 1 (chloride anion) charge. Note that these transactions can normally only take place simultaneously: in order for a sodium atom to lose an electron, it must be in the presence of a suitable recipient like a chlorine atom. Choices: - molecules - electrons - protons - ions A:
Answer: ions

*Question*
Q: What type of reaction is a process in which some substances, called reactants, change into different substances, called products? Read this paragraph and choose the correct option from the provided answers: A chemical reaction is a process in which some substances, called reactants, change into different substances, called products. During the reaction, chemical bonds break in the reactants and new chemical bonds form in the products. Choices: - reversible reaction - physical reaction - toxic reaction - chemical reaction A:
**Answer**
chemical reaction

(Q).
Q: What is the position of rock layers and the relative ages called? Read this paragraph and choose the correct option from the provided answers: Superposition refers to the position of rock layers and their relative ages. Relative age means age in comparison with other rocks, either younger or older. The relative ages of rocks are important for understanding Earth's history. New rock layers are always deposited on top of existing rock layers. Therefore, deeper layers must be older than layers closer to the surface. This is the law of superposition . You can see an example in Figure below . Choices: - diffraction - metamorphism - bifurcation - superposition A:
(A).
superposition