What are four alternative sources of energy? The most popular renewable energy sources currently are: Solar energy. Wind energy. Hydro energy. Tidal energy. Geothermal energy. Biomass energy. Why do we need an alternative energy source? Environmental and economic benefits of using renewable energy include: Generating energy that produces no greenhouse gas emissions from fossil fuels […]
How do organisms defend themselves?
How do organisms defend themselves? Many plants have impenetrable barriers, such as bark and waxy cuticles, or adaptations, such as thorns and spines, to protect them from pathogens. Plants produce antimicrobial chemicals, antimicrobial proteins, and antimicrobial enzymes that are able to fight the pathogens. What protect the plant from being eaten by animals? Use ready […]
Is snow solid water?
Is snow solid water? Snow, by a simple definition, is a group of loosely connected ice crystals; ice is the solid form of water. It is more than just frozen rain, which would be called sleet, because water vapor turns directly into ice, totally skipping the liquid phase. What is solid snow called? Perennial snow […]
Are there sharks in the Yellow Sea?
What would happen if the tectonic plates continue to move?
What would happen if the tectonic plates continue to move? Even though plates move very slow the motion of the plates moving is called plate tectonics, has a huge impact on the Earth. Plate tectonics form the oceans, continents, and mountains. It also helps us understand why and where natural disasters like earthquakes occur and […]
How is heat transferred to Earth?
How is heat transferred to Earth? Energy is transferred between the Earth’s surface and the atmosphere in a variety of ways, including radiation, conduction, and convection. Conduction is one of the three main ways that heat energy moves from place to place. The other two ways heat moves around are radiation and convection. Which is […]
What is variety in principles of training?
What is variety in principles of training? The principle of variety is ensuring training sessions use multiple training types and methods, as well as exercises within these methods. Variety is needed in training, not only to prevent boredom, but also to ensure complete and full development of fitness. What is variety principle? Variety is the […]
How do kidneys maintain pH balance?
How do kidneys maintain pH balance? The kidneys have two main ways to maintain acid-base balance – their cells reabsorb bicarbonate HCO3− from the urine back to the blood and they secrete hydrogen H+ ions into the urine. By adjusting the amounts reabsorbed and secreted, they balance the bloodstream’s pH. What organ is most critical […]
What is called concave mirror?
What is called concave mirror? A concave mirror, or converging mirror, has a reflecting surface that is recessed inward (away from the incident light). These mirrors are called “converging mirrors” because they tend to collect light that falls on them, refocusing parallel incoming rays toward a focus. What is difference between convex and concave mirrors? […]