How do lava use in a sentence?

The sentence "lava use" doesn't make grammatical sense. You need to tell us *what* the lava is being used *for*. Here are some examples:

* The ancient Hawaiians used lava rock to build their homes. (This shows lava being used as a building material.)

* Scientists study lava flows to learn about the Earth's interior. (This shows lava being used for scientific research.)

* The heat from the lava can be used to generate electricity. (This shows lava being used as an energy source.)

Please provide more context or information about what you'd like to say about lava, and I can help you construct a proper sentence.