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Answers
1) what do you understand by an electric Current?
Electric current is expressed as the amount of charge flowing through a particular area in unit time. Quantitatively, electric current is defined as the rate of flow of electric charge.
2) Sorry don't know
3) Electromagnetic Induction is the process of using magnetic fields to produce voltage, and in a closed circuit, a current. So how much voltage (emf) can be induced into the coil using just magnetism.
4) One easy way to tell which pole is north and which is south is to set your magnet near a compass. The needle on the compass that normally points toward the north pole of the Earth will move toward the magnet's south pole.
5) The ignition temperature of a substance is the least temperature at which the substance starts combustion
6)Nuclear energy, also called atomic energy, energy that is released in significant amounts in processes that affect atomic nuclei, the dense cores of atoms. It is distinct from the energy of other atomic phenomena such as ordinary chemical reactions, which involve only the orbital electrons of atoms.
7) Irrigation helps to grow agricultural crops, maintain landscapes, and revegetate disturbed soils in dry areas and during periods of less than average rainfall. Irrigation also has other uses in crop production, including frost protection, suppressing weed growth in grain fields and preventing soil consolidation.
8) Weed control is vital to agriculture, because weeds decrease yields, increase production costs, interfere with harvest, and lower product quality. Weeds also impede irrigation water-flow, interfere with pesticide application, and harbour disease organisms
9) An ecosystem is a community of living organisms in conjunction with the nonliving components of their environment, interacting as a system. These biotic and abiotic components are linked together through nutrient cycles and energy flows
10) the process by which green plants turn carbon dioxide and water into food using energy from sunlight
11)Pollution is the introduction of contaminants into the natural environment that cause adverse change. Pollution can take the form of chemical substances or energy, such as noise, heat, or light.
12) rain that has harmful chemicals in it from factories, etc. that causes damage to trees, crops, buildings and rivers
13) Soil contamination or soil pollution as part of land degradation is caused by the presence of xenobiotics (human-made) chemicals or other alteration in the natural soil environment
14)Hydropower is energy in moving water Hydropower was one of the first sources of energy used for electricity generation and and until 2019, hydropower was the largest source of total annual U.S. renewable electricity generation.