Back in 1913, little was known about the composition of the Earth's interior, so we'll excuse Webby's exclusion of this important topic.
When viewed in cross-section, the Earth is typically divided into three layers: the outer crust
Back in 1913, little was known about the composition of the Earth's interior, so we'll excuse Webby's exclusion of this important topic.
When viewed in cross-section, the Earth is typically divided into three layers: the outer crust, the mantle and the core. British schoolchildren are given the analogy of a Scotch egg: with breadcrumbs (the crust), sausage (the mantle), the egg white (the outer core) and the yolk (the inner core). Of these three layers, the mantle is t