When is national astronomy day?

First to answer will be the brainliest i need the answer asap

Nstrumental music that supports the main part(s) chamber music 2. a large group of instruments usually including woodwinds, brass, and percussion band 3. music written for small ensembles for an intimate setting accompaniment 4. a person who leads an ensemble conductor 5. an electronic keyboard capable of multiple instrument sounds

What caused many of the moai at easter island to be destroyed?