Why does cold air sink and hot air rise? Hot air is less dense than cold air, which is why hot air rises and cold air sinks, according to the United States Department of Energy. Warm air currents typically bring rain, because they form over oceans. Does warm air rise or sink does cold air […]
How are humans affected by climate change?
How are humans affected by climate change? Human health is vulnerable to climate change. The changing environment is expected to cause more heat stress, an increase in waterborne diseases, poor air quality, and diseases transmitted by insects and rodents. Extreme weather events can compound many of these health threats. How many people are affected by […]
What is potential energy short answer?
What is potential energy short answer? Potential energy is energy that an object has because of its position relative to other objects. It is called potential because it has the potential to be converted into other forms of energy, such as kinetic energy. Potential energy is usually defined in equations by the capital letter U […]
What is a big disadvantage of the drum brake?
What is a big disadvantage of the drum brake? Drum brake disadvantages Excessive heating can happen due to heavy braking, which then can cause the drum to distort, and thus cause vibration under braking. Under hard braking, the diameter of the drum increases slightly due to thermal expansion, the driver must press the brake pedal […]
How can you say one substance is different from other?
How can you say one substance is different from other? Different substances have different properties; density is one property that can be used to tell two substances apart. Density is a property that does not depend on the shape or size of an object. What is formed when two or more substances are combined? Two […]
What is the effect of watering plant on their growth height?
What is the effect of watering plant on their growth height? Water helps a plant by transporting important nutrients through the plant. Nutrients are drawn from the soil and used by the plant. Without enough water in the cells, the plants droop, so water helps a plant to stand. Water carries the dissolved sugar and […]
Which object is a natural source of light?
Which object is a natural source of light? the Sun What happens to light after it hits a mirror? Reflection occurs when light bounces off of Reflection occurs when light bounces off of a surface. When you look in a mirror, you can see your image because when parallel light rays hit the mirror at […]
How do you know if a rock is metamorphic?
How do you know if a rock is metamorphic? Metamorphic rocks are rocks that have become changed by intense heat or pressure while forming. One way to tell if a rock sample is metamorphic is to see if the crystals within it are arranged in bands. Examples of metamorphic rocks are marble, schist, gneiss, and […]