You may omit the comma following a short introductory phrase: On Thursday the committee decided the dispute. In 1954 the Supreme Court desegregated the public schools. But if you omit this comma once, you should do the same throughout the paper for all short introductory phrases.
But, over time the differences seen among the ever growing number of these visitors has led to many more categories than three. At the present there are approximately fifty types of meteorites recognized. They still fall mainly into the three original families; the irons, the stony-irons and the stones.
There are four different types of volcanoes. A volcano is categorized both by formation and appearance. Different types of volcanoes also indicate the types of expected eruptions. The different types of volcanoes are: composite (or stratovolcanoes), shield, cinder cones and spatter cones.Throughout the world, one can see pictures of the four types of volcanoes, each type indicative of the active underground world we often view as static.he different types of volcanoes are: composite (or stratovolcanoes), shield, cinder cones and spatter cones. Throughout the world, one can see pictures of the four types of volcanoes, each type indicative of the active underground world we often view as static.