Unit 1
This bright round object shines in the night sky and travels around the Earth.
What is the moon?
I am a scientist who studies stars, planets, and outer space. Who am I?
What is an astronomer?
People who fight as part of an army to protect their country or ruler
This is the hard bone framework of the head that protects the brain and gives an animal its face shape.
What is a skull?
You look through this tube-shaped tool with lenses to make faraway stars and planets look much closer and bigger.
What is a telescope?
This is the invisible force that pulls objects toward each other and keeps our feet on the ground instead of floating into space.
What is gravity?
A very large, organized group of soldiers trained to fight on land
What is army?
When a volcano erupts, it shoots this grey, powdery dust high into the sky.
What is ash?
This consists of our sun and all the eight planets that travel around it.
What is the solar system?
These are large, bowl-shaped holes on the surface of the moon or a planet, made when space rocks crash into them.
What are craters?
The special matching clothes that all soldiers, police officers, or students must wear.
What is uniform?
This type of rock is formed over millions of years as sand, mud, and tiny pebbles are pressed together in flat stripes at the bottom of water.
What is sedimentary rock?
This is an icy space object that develops a bright, glowing tail of gas and dust when it flies close to the sun.
What is a comet?
Anything in the universe that takes up space and has weight—solids, liquids, and gases.
What is matter?
A type of wet, sticky earth that can be shaped by hand on a wheel and baked to make bowls, pots, or statues.
What is clay?
A deep, narrow gorge with steep sides, often carved out by a flowing stream
What is ravine?
Everything that exists anywhere—all of space, time, matter, galaxies, and stars combined.
What is the universe?
A straight line measurement passing from one side of a round planet to the other side, right through the center.
What is diameter?
In ancient times, a poor farmer who worked hard in the rice fields and had very low social status.
What is peasant?
To carefully dig away dirt and rock with brushes and tools to uncover buried fossils or ancient bones.
What is excavate?