Question 11 Which of the following is a disadvantage of solar energy?
O the solar energy is free
O it produces waste and pollution through greenhouse gases
o it's costly to build solar power stations
O it can be replenished

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Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.