Answer the following question given this paragraph: More than one force may act on an object at the same time. In fact, just about all objects on Earth have at least two forces acting on them at all times. One force is gravity, which pulls objects down toward the center of Earth. The other force is an upward force that may be provided by the ground or other surface. Q: How many forces do objects on earth have acting on them at all times? Choices: - ten - three - four - two A:
two
Answer the following question given this paragraph: The driving force to combine with nonmetals to create ionic compounds varies quite a bit between different metals. Some pure metals, like cesium and potassium, are so eager to react that they must be stored under oil to avoid an immediate reaction with the oxygen present in air. Others, like platinum and gold, are stable enough that they can be found in nature as pure metals rather than as the cationic portion of an ionic compound. Gradual degradation of a material due to its exposure to the environment is known as corrosion . Metals like gold and platinum are unusually resistant to corrosion, which makes them especially valuable for both structural and decorative purposes. Q: Gradual degradation of a material due to its exposure to the environment is known as what? Choices: - metabolism - erosion - destruction - corrosion A:
corrosion
Q: Answer the following question given this paragraph: One of the fundamental laws of chemistry deals with the fact that we cannot (using chemical means) create or destroy matter. When a reaction is run, the number of atoms of each specific type must be the same on both sides of the equation. For some materials, it turns out that one element can combine with a second element in more than one ratio. Carrying out mass ratio calculations helped establish the law of multiple proportions. Q: One of the fundamental laws of chemistry deals with the fact that we cannot create or destroy what? Choices: - time - protein - stars - matter A:
A: matter
Question: Answer the following question given this paragraph: Birds are thought to have evolved from theropod dinosaurs around 150 million years ago. Q: Birds are thought to have evolved around 150 million years ago from what? Choices: - teradactils - raptor dinosaurs - parrot dinosaurs - theropod dinosaurs A:
Answer: theropod dinosaurs
*Question*
Answer the following question given this paragraph: Light As with auditory stimuli, light travels in waves. The compression waves that compose sound must travel in a mediuma gas, a liquid, or a solid. In contrast, light is composed of electromagnetic waves and needs no medium; light can travel in a vacuum (Figure 36.16). The behavior of light can be discussed in terms of the behavior of waves and also in terms of the behavior of the fundamental unit of lighta packet of electromagnetic radiation called a photon. A glance at the electromagnetic spectrum shows that visible light for humans is just a small slice of the entire spectrum, which includes radiation that we cannot see as light because it is below the frequency of visible red light and above the frequency of visible violet light. Certain variables are important when discussing perception of light. Wavelength (which varies inversely with frequency) manifests itself as hue. Light at the red end of the visible spectrum has longer wavelengths (and is lower frequency), while light at the violet end has shorter wavelengths (and is higher frequency). The wavelength of light is expressed in nanometers (nm); one nanometer is one billionth of a meter. Humans perceive light that ranges between approximately 380 nm and 740 nm. Some other animals, though, can detect wavelengths outside of the human range. For example, bees see near-ultraviolet light in order to locate nectar guides on flowers, and some non-avian reptiles sense infrared light (heat that prey gives off). Q: What is the wavelength of light expressed in? Choices: - nanoseconds - millimeters - vatts - nanometers (nm) A:
**Answer**
nanometers (nm)
(Question)
Answer the following question given this paragraph: Angiosperms are important to humans in many ways, but the most significant role of angiosperms is as food. Wheat, rye, corn, and other grains are all harvested from flowering plants. Starchy foods, such as potatoes, and legumes, such as beans, are also angiosperms. And, as mentioned previously, fruits are a product of angiosperms that increase seed dispersal and are nutritious. Q: What are angiosperms most important function to humans? Choices: - oxygen production - gasoline - water filtration - food A:
(Answer)
food