Once you get through the crust, they make friends for life.

It will take fifty days just to get through the crust.

The idea is to see whether any neutrinos change type during their long trip through the earth's crust.

What immense forces suddenly burst through the earth's crust that fall?

But it is not easy to cut through the dense crust of anxiety that has been built up in the last month or so.

For the first time, the natural man broke through the crust of icy restraint.

Something forced up through the crust of the earth.

I am reading numerous earthquakes moving through the planet's crust.

We have passed entirely through its crust to the inner world.

Once we break through the crust the thing should fall apart in hours.