Welcome to Learning English, a daily 30-minute program from the Voice of America.

I'm Katie Weaver.

And I'm Mario Ritter Jr. This program is designed for English learners, so we speak a little slower and we use words

and phrases especially written for people learning English.

Coming up on the show, Jill Robbins and Gregory Stockle bring us education tips. We close the show with

The Lesson of the Day. But first, this story from Brian Lynn. Scientists are worried that a large iceberg heading toward an island in the South Atlantic Ocean could threaten wildlife there.

Researchers say the iceberg is the largest in the world. It is moving through the South Atlantic

toward the island of South Georgia. The island is a British overseas territory that is about

1,400 kilometers east of the Falkland Islands.

Scientists say South Georgia is a main mating ground for wildlife, especially penguins and seals.

The iceberg is officially known as A23A, and it measures about 3,500 square kilometers.

It has existed since 1986 when it broke off from the Antarctic shelf.

Andrew Myers is an oceanographer with the British Antarctic survey.

He told the French news agency, AFP, that scientists have been using satellite imagery to follow the iceberg's movements.

Myers said observations had shown the iceberg had not broken into smaller pieces,

like some other so-called megabergs that passed through the southern ocean.

He added that predicting the iceberg's exact path is difficult,

but ocean conditions suggest it should reach South Georgia in two to four weeks.

Myers said he is worried the iceberg will get caught on the underground continental shelf

around South Georgia. But he said it is also possible the large ice mass could miss the

shelf and continue moving into open waters beyond South Georgia. If the iceberg does get caught or stuck on the shelf,

Myers said it could remain there for months, or it could break into pieces.

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