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The four types of lines are <em>horizontal</em> <em>line</em>, <em>vertical </em><em>line</em>, <em>parallel</em> <em>line</em> <em>and</em> <em>perpendicular</em> <em>line</em>. They are defined by their orientation and the angles formed between them.
The Viking Explorer Who Beat Columbus to America. Leif Eriksson Day commemorates the Norse explorer believed to have led the first European expedition to North America.
Layers that are less dense, such as the crust<span>, float on layers that are denser, such as the mantle. Both </span>oceanic crust and continental crust<span> are less dense than the mantle, but </span>oceanic crust<span> is denser than </span>continental crust<span>. This is partly why the </span>continents <span>are at a higher elevation than the </span>ocean<span> floor.</span>
