Identify the Main Idea

Front

Passage: A starfish opens a clam by wrapping its arms around it and pulling until the shell opens. This story mainly tells:

Back

How starfish open clams.

Front

Passage about smoke, fog, and smog.

Back

How we get smog.

Front

Passage about bear behavior: Some claim bears use a 'bear hug' to defeat enemies, but they actually strike with paws, claws, and teeth. One paw strike is often sufficient.

Back

How a bear fights.

Front

Signal smoke indicates trouble for boats/airplanes.

Back

What signal smoke means.

Front

Passage #5 discusses how people used to tuck gloves under their belts due to poor fit and appearance.

Back

What gloves were like long ago.

Front

Mushrooms don’t grow on trees. Red squirrels put them there for winter food.

Back

Why there are mushrooms in trees.

Front

Passage #7 discusses why we rarely find dead birds.

Back

Why we don't see many dead birds.

Front

Passage about polar bears: they grow very big, weighing 1000 lbs as adults and 1 lb at birth. Main idea?

Back

How big polar bears grow.

Front

Passage #9 discusses the prevalence of salt in various aspects of life.

Back

How salty the world is.

Front

Passage about the king crab: not a real crab, 2 feet long, 12 legs, stays underwater, searches for food.

Back

What the king crab is like.