1.   Even in the depths of winter the sea ice is never a complete cover.

2.   How thick is the ice on the lake now?

3.   I hope the ice is strong enough to take my weight.

4.   Ice is less dense than water, which is why it floats.

5.   Ice monitors have been out drilling and measuring, and already the flat sea ice is strong enough to walk on.

6.   Ice skating was great fun and fairly easy to learn which really surprised me.

7.   If ice is available at the site of the lunar base, then the situation is dramatically different.

8.   Logistic considerations make the Moon a very attractive base of operations if ice is abundant in the lunar polar regions.

9.   The ice is fickle, sometimes weakened by sunlight, or corroded by trapped air.

10.   The ice is thick and he is a good deal less enthusiastic when the tip breaks through.