The results of Meiosis I are two diploid cells with genetic differences on the chromosome. These differences are a result of crossing-over. Crossing-over is a process that happens after both homologous chromosomes in a pair join up to form a structure called a tetrad. Tetrads form through a process called synapsis.
A tide is the periodic rising and falling of Earth's ocean surface caused mainly by the gravitational pull of the Moon acting on the oceans. Tides cause changes in the depth of marine and estuarine (river mouth) waters. Tides also make oscillating currents known as tidal streams (~'rip tides'). This means that being able to predict the tide is important for coastal navigation.
Ocean tides are caused by the gravitational interaction between the Earth and the Moon. There are two high tides and two low tides each day. During New Moon and Full Moon the difference between high and low tides is more extreme. Those are called spring tides. During First Quarter and Last Quarter phases of the Moon the difference between high and low tides is less extreme. Those are called neap tides.