Define S-block elements with one example

The s-block elements of the Periodic Table are those in which the last electron enters the outermost s-orbital. ... The elements of Group 2 include beryllium, magnesium, calcium, strontium, barium and radium. These elements with the exception of beryllium are commonly known as the alkaline earth metals.

organisms are more likely to be more preserved in mud than sand because mud is moist and wet, while sand is very dry.