Ice-cream is a delicious frozen treat that comes in a many different colors and flavors.  Two of my favorite flavors are strawberry and chocolate.  Though both of these flavors are delicious, strawberry may contain pieces of fruit while chocolate usually will not.  Even though more chocolate ice-cream is sold across the country annually than strawberry, each flavor tastes great inside of a milk shake. 

Wild chimpanzees are rapidly disappearing. Some people are trying to solve this problem. Otherwise, chimpanzees may one day exist only in zoos. People are trying to save the rain forests and woodlands where the chimps live from being cut down. It will take many people working together to solve this problem

When Americans settled the Midwest, they were challenged by tough soils that resisted their cast iron plows. The Midwest contains some of the richest soil in the world, yet many settlers concluded that the soil was unsuitable for farming because they couldn't break ground. John Deere's steel plow changed all of that. Deere's plow was stronger and lighter than the iron plows people had used up until then. This allowed settlers to open up the tough but rich soil in the Midwest and unlock its agricultural potential. His invention became known as "The Plow that Broke the Plains," and it helped American farmers feed the world.

You may not know who Mark Zuckerberg is but I bet you know about Facebook. Zuckerberg and his roommates launched Facebook from their college dormitory at Harvard. Facebook started off as just a "Harvard thing," but Zuckerberg and roommates spread it to other universities like Stanford, Dartmouth, and NYU. As Facebook grew in size and popularity, Zuckerberg took investments but resisted buyout offers. The founders maintained control and in 2012 Facebook became a publically traded company. Today Facebook is one of the world’s most popular websites and Zuckerberg is the CEO. Facebook has over one billion users and Zuckerberg is one of the 25 richest people in America. That’s not too bad for a college dropout. 

Thomas Edison became known as "The Wizard of Menlo Park" in 1877, when he invented the phonograph. Edison's phonograph allowed people to record sounds and replay them. Though this technology was unimpressive by today's standards—his recordings would only play few times and the sound quality was poor— back then Edison’s device appeared to be magical. That's why people called Edison "The Wizard of Menlo Park," because they suspected him of witchcraft. 

Choose the clue words that indicate chronological order.

Choose the clue words that indicate compare and contrast.

What type of text structure?
Plate Tectonics - The surface of the Earth is divided into pieces called "tectonic plates."  These plates move. When the plates rub against each other, they do not move smoothly. When the plates do not move smoothly, earthquakes result.  Some parts of the world get more earthquakes than other parts. The parts of the earth that get most earthquakes are near the edges of these plates.