A Fall of Moondust

a Determinative

— A is used when the following word could be any of a certain type. Compare "A book I saw on the shelf" and "The book I gave you yesterday".

a Noun

— A is the first letter of the alphabet. The letter "a" comes before "b". — In some schools, an A is a very high grade. Ron got an A on his earth science test.

fall Verb

— When something or someone falls, it moves down quickly down through the air because nothing is holding it. It moves to a lower position because of gravity. The apple fell from the tree. The bridge is falling down. He tripped on a banana peel and fell down, hurting his leg. — When someone falls, they can mean coming down to the ground on purpose, lying with the face down. He fell to the floor and begged for mercy. — Falling is when someone or something has been defeated. The Romans fell to the Goths in 410 AD.

fall Noun

— Fall is the name for autumn used only in North America, named after the falling of leaves during the season. It is the season when the weather is getting colder, after summer and before winter. These plants are growing big and they will be ready to eat in the fall. — A fall or falls or waterfall is a part of a river where water is falling. We went to the falls to eat lunch outside and watch the water falling. — A fall is when people suffered a loss of greatness or status, such as the fall of Rome.

of Preposition

— Made using. It is a house of cards.

moondust noun

— the fine regolith found on the surface of the Moon