1.   Corn jumped amid concern that a heat wave forecast for the Midwest could harm development of the fall crop.

2.   In other markets, corn jumped while copper rose.

3.   Corn jumped upward from the opening bell amid the brightened outlook for U.S. exports over the holiday season.

4.   Corn jumped on the opening after the U.S. Department of Agriculture released weekly data showing a significant decline in crop ratings in the week ended Sunday.

5.   Corn jumped to three-week highs during the session.

6.   Corn jumped to two-week highs before fading to finish with slight gains.

7.   Corn had jumped to a three-week high on Monday on reports of a new export agreement with Japan.

8.   Corn jumped higher for similar reasons.

9.   Corn jumped to four-month highs on fears that the coming heat wave will reduce the yield.