1.   The inland areas became lower than the silty areas near the coast and lower than the river channels.

2.   Eh also varies with pH, becoming generally lower as alkalinity increases.

3.   As a result of the acquisitions, sales and profit margins have risen smartly as expenses have become lower.

4.   As the tube is lengthened by extending the slide, the air has to travel farther and so the notes become progressively lower.

5.   Instead of becoming lower, it becomes higher.

6.   Water levels rose as the ceiling became lower.