Help i'll give brainliest! help with 15 just make the answer clear please

Explanation:

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A thermal battery could help a solar power plant generate electrical energy 24 hours per day by storing the energy the solar power plant made so that when it's either a cloudy day or night the energy that the thermal battery collected can be released and used at night or on that cloudy day.

this is correct my teacher accepted this as the answer.

Explanation:

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation:

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.