tongue-in-cheek is a gesture which indicates irony or facetiousness (you don't mean what you say).

"Helen is always so tactful!"

Ice is less dense than liquid water, so it floats. In liquid water hydrogen bonds between the O--H of one water molecule and the --H of the water molecules next to it make a more tightly bound, or denser, liquid. Freezing breaks these hydrogen bonds, allowing the ice to take up more room than the water did. So ice is less dense and floats.

This unusual property of water is very important for life on Earth. It keeps fish from freezing in ponds of solid ice.

Ice is less dense than liquid water, so it floats. In liquid water hydrogen bonds between the O--H of one water molecule and the --H of the water molecules next to it make a more tightly bound, or denser, liquid. Freezing breaks these hydrogen bonds, allowing the ice to take up more room than the water did. So ice is less dense and floats.

This unusual property of water is very important for life on Earth. It keeps fish from freezing in ponds of solid ice.

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It was more of a stake. It didn't have a crosspiece or second beam running across. It is also called a tree, as in, "Were you there when they nailed Him to a tree?"

It was more of a stake. It didn't have a crosspiece or second beam running across. It is also called a tree, as in, "Were you there when they nailed Him to a tree?"

Water boils at 212•F, at standard pressure.

Water boils at 212*F,st standard pressure.