<span>A lunar eclipse occurs when the Earth passes between the Moon and the Sun, and the Earth's shadow obscures the moon or a portion of it. A solar eclipse occurs when the Moon passes between the Earth and the Sun, blocking all or a portion of the Sun. </span>
Oh this is easy.
Astronomy is the branch
Ice floats because it expands (kid version). The molecules are less dense in ice than when water (H2O) and the structure is different.
Hope that help