In this task, you will be presented with a context passage, a question about that paragraph, and a possible answer to that question. The task is to check the validity of the answer. Answer with "Yes" or "No".
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Question: Imagine you are standing in a farm field in central Illinois. The land is so flat you can see for miles and miles. On a clear day, you might see a grain silo 20 miles away. You might think to yourself, it sure is flat around here. If you drive one hundred miles to the south, the landscape changes. In southern Illinois, there are rolling hills. Why do you think this is? What could have caused these features? There are no big rivers that may have eroded and deposited this material. The ground is capable of supporting grass and trees, so wind erosion would not explain it. To answer the question, you need to go back 12,000 years. Around 12,000 years ago, a giant ice sheet covered much of the Midwest United States. Springfield, Illinois, was covered by over a mile of ice. Its hard to imagine a mile thick sheet of ice. The massive ice sheet, called a glacier, caused the features on the land you see today. Where did glaciers go? Where can you see them today? Glaciers are masses of flowing ice. <sep>How long ago was Springfield, Illinois covered by over a mile of ice?<sep>1,200 years ago

Answer: No

Question: While the Base Ball writers of the cities which comprise the Southern Association have no organized membership similar to the Base Ball Writers' Association of the major leagues and the organizations which are best known as the class AA leagues, they are a clever, hard-working group of young men, who have labored in season and out of season, not only to build up Base Ball but to build it up on the right lines. Experience of more than a quarter of a century has most abundantly proved that the standard of Base Ball has steadily been elevated. It needs no compilation of fact nor any dogmatic assertion on the part of the Editor of the GUIDE to attest that fact. It is a present condition which speaks for itself. The general tone of the players is far higher than it was and there has come into evidence a marked improvement in the spirit of the men who own Base Ball clubs. In the earlier history of the sport there was a tendency to win by any means that did not actually cross the line of dishonesty. Later there came a season when the commercial end of the game tended to encroach upon the limits of the pastime. This has been repressed in the last two seasons and to-day the morale of Base Ball is of a higher type than it ever has been in the history of the pastime. <sep>What characteristics of the pastime of baseball has been repressed?<sep>They are a clever and hard-working

Answer: No

Question: Oh no! Your younger sister just mixed up all of your LEGO parts. Now you have to put them all back into the original categories. How will you do this? You sort them by size and shape until they are each back into their specific place in the tray. What do you think you could have called the mess your younger sister created? Thats right, it is a mixture. Fortunately, it was a physical change and she just made a simple mixture. You are able to separate them back into order. Its a good thing she did not toss them into the fireplace. That would have caused a chemical change as they all melted together. If your LEGOs were melted, you would be out of luck for building that next big project. <sep>What kind of change would have happened if your sister had thrown your LEGOs into the fireplace?<sep>A chemical change from the melting LEGO parts

Answer:
Yes