例句與造句

1. So-called " Rootless cones " are caused by explosions of lava with ground ice under the flow.
2. Rootless cones have also been discovered in the Athabasca Valles region of Mars, where lava flows superheated groundwater in the underlying rocks.
3. Rootless cones are formed by steam explosions as flowing hot lava crosses over a wet surface, such as a swamp, a lake, or a pond.
4. It's difficult to find rootless cones in a sentence. 用rootless cones造句挺難的