The north end of Earth's axis is tilted toward the sun from March 21 until
September 21 ... Spring and Summer in the northern hemisphere, which
includes North America.
Volcanologist specialize in the study of Volcanos.
Seismologists specialize in the study of siesmic waves .
Surveying encompasses every aspect of land, property and construction and offers a wide variety of career options. <span>There are many types of disciplines in surveying and a surveyor during their career may decide to specialize in a particular discipline or may gain experience in all disciplines.</span>
