Words to Know
cascade
a small waterfall; water falling in a series of steps
From: The Hidden Waterfall
cliff
a steep, high rock face
From: The Hidden Waterfall
mist
tiny drops of water in the air near a waterfall
From: The Hidden Waterfall
countdown
counting backward to zero before something starts
From: Space Explorers
orbit
the curved path an object takes around a planet
From: Space Explorers
crew
a group of people who work together on a ship
From: Space Explorers
reef
a ridge of coral near the surface of the sea
From: Sea Turtles
migrate
to travel a long way at the same time each year
From: Sea Turtles
magma
melted rock under the surface of the earth
From: Understanding Volcanoes
erupt
to burst out suddenly
From: Understanding Volcanoes
chest
a strong wooden box used for storing things
From: The Lost Treasure
soil
the top layer of earth where plants grow
From: The Brave Little Seed