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When the sun<span>, </span>moon<span>, and </span>Earth<span> are in </span>alignment<span> (at the time of the new or full</span>moon<span>), the solar </span>tide<span> has an additive effect on the lunar </span>tide, creating extra-high hightides<span>, and very low, low </span>tides<span> — both commonly called </span>spring tides<span>.</span>
Low literacy level means that many people can't read. Being able to read is a factor that can help prevent the spread of AIDS and HIV as it can lead to the distribution of information leaflets and information in general.
If people can't read, they have less access to information and cannot learn about the ways of preventing the spread of HIV.