*Question*
Q: What helps pumice float in water? Read this paragraph and choose the correct option from the provided answers: Some extrusive igneous rocks cool so rapidly that crystals do not develop at all. These form a glass, such as obsidian. Others, such as pumice, contain holes where gas bubbles were trapped in the lava. The holes make pumice so light that it actually floats in water. The most common extrusive igneous rock is basalt. It is the rock that makes up the ocean floor. Shown below are three types of extrusive igneous rocks ( Figure below ). Choices: - high density - large mass - gravity - gas bubble holes A:
**Answer**
gas bubble holes

*Question*
Q: What is measured using units pascal, bar, atmosphere or mmhg? Read this paragraph and choose the correct option from the provided answers: strong enough to keep the particles of substance together but not in place. Thus, the particles are free to move over each other but still remain in contact. In gases, the intermolecular interactions are weak enough that the individual particles are separated from each other in space. The kinetic theory of gases is a collection of statements that describe the fundamental behavior of all gases. Among other properties, gases exert a pressure on their container. Pressure is measured using units like pascal, bar, atmosphere, or mmHg (also called atorr). There are several simple relationships between the variables used to describe a quantity of gas. These relationships are called gas laws. Boyle's law relates the pressure and volume of a gas, while Charles's law relates the volume and absolute temperature of a gas. The combined gas law relates the volume, pressure, and absolute temperature of a gas sample. All of these gas laws allow us to understand the changing conditions of a gas. The ideal gas law relates the pressure, volume, amount, and absolute temperature of a gas under any conditions. These four variables are related to the ideal gas law constant, which is the proportionality constant used to calculate the conditions of a gas. Because the conditions of a gas can change, a set of benchmark conditions called standard temperature and pressure (STP) is defined. Standard temperature is 0C, and standard pressure is 1.00 atm. Choices: - fuel - Muscle - push - pressure A:
**Answer**
pressure

*Question*
Q: What type of relationship is it when one variable increases the other variable decreases? Read this paragraph and choose the correct option from the provided answers: The relationship between mass and acceleration is different. It is an inverse relationship. In an inverse relationship, when one variable increases, the other variable decreases. The greater the mass of an object, the less it will accelerate when a given force is applied. For example, doubling the mass of an object results in only half as much acceleration for the same amount of force. Choices: - divergence - curve - regression - inverse A:
**Answer**
inverse

*Question*
Q: What system is the spinal cord related to? Read this paragraph and choose the correct option from the provided answers: Some people recover from spinal cord injuries. But many people are paralyzed for life. Thanks to the work of Christopher Reeve ( Figure below ), more research is being done on spinal cord injuries now than ever before. For example, scientists are trying to discover ways to regrow damaged spinal cord neurons. Choices: - circulatory system - lymphatic system - digestive system - nervous system A:
**Answer**
nervous system