Q: Q: When fuel is burned, most of the energy is released in what form? Read this paragraph and choose the correct option from the provided answers: When fuel is burned, most of the energy is released as heat. Some of this heat can be used to do work. Heat cooks food or warms your house. Sometimes the heat is just waste heat. It still heats the environment, though. Choices: - precipitation - carbon dioxide - humidity - heat A:
A: heat

Q: Q: What simple machine consists of two connected rings or cylinders, one inside the other, which both turn in the same direction around a single center point? Read this paragraph and choose the correct option from the provided answers: A wheel and axle is a simple machine that consists of two connected rings or cylinders, one inside the other, which both turn in the same direction around a single center point. When force is applied to the inner axle, the ideal mechanical advantage is less than 1. When force is applied to the outer wheel, the ideal mechanical advantage is greater than 1. Choices: - pully - bloom and axle - spoke - wheel and axle A:
A: wheel and axle

Q: Q: What is the diversity of living things called? Read this paragraph and choose the correct option from the provided answers: Life on Earth is very diverse. The diversity of living things is called biodiversity . A measure of Earth's biodiversity is the number of different species of organisms that live on Earth. At least 10 million different species live on Earth today. They are commonly grouped into six different kingdoms. Examples of organisms within each kingdom are shown in Figure below . Choices: - degradation - life cycle - ecosystem - biodiversity A:
A: biodiversity

Q: Q: What is the rising and sinking of warm and cooler material called? Read this paragraph and choose the correct option from the provided answers: Hot lower mantle material rises upward ( Figure below ). As it rises, it cools. At the top of the mantle it moves horizontally. Over time it becomes cool and dense enough that it sinks. Back at the bottom of the mantle, it travels horizontally. Eventually the material gets to the location where warm mantle material is rising. The rising and sinking of warm and cooler material is called convection . Choices: - depression - conveyance - diffusion - convection A:
A: convection