Find the Main Idea
A: According to Weather.com, a very strong wildfire can create a “pyrocumulus cloud.”
B: It looks like a thunderstorm cloud.
C: If the cloud has enough updraft, a relatively small firewhirl can grow big enough to look like a regular tornado.
A: According to Weather.com, a very strong wildfire can create a “pyrocumulus cloud.”
A: It’s a hot day in the middle of the summer.
B: Bees are buzzing, mosquitoes whining, butterflies flitting, and houseflies and dragonflies darting here and there.
B: Bees are buzzing, mosquitoes whining, butterflies flitting, and houseflies and dragonflies darting here and there.
A: Bees do more than just buzz around.
B: A Bee Up Close
C: They make the sweet golden liquid called honey.
D: They also produce beeswax, which is used in candles, makeup, and other products.
B: A Bee Up Close
A: Bees do more than just buzz around.
B: Butterflies start their lives as caterpillars.
C: They make the sweet golden liquid called honey.
D: They also produce beeswax, which is used in candles, makeup, and other products.
B: Butterflies start their lives as caterpillars.
The Vikings made their biggest impact on the world between the late 8th century CE and the late 11th century CE.
The Vikings were definitely fierce warriors, cruel conquerors, and mighty raiders.
They were also great poets and storytellers.
They made important contributions to civilization.
A: Vikings were people from the past who were very skilled in many areas.
B: Vikings aren't alive anymore.
A: Vikings were people from the past who were very skilled in many areas.
A: It used water pressure to clean.
B: It had wire compartments for the dishes, which fit into a wheel inside a copper boiler.
C: The first dishwasher design had lots of moving parts.
D: A motor turned the wheel while soapy water sprayed onto the dishes.
C: The first dishwasher design had lots of moving parts.
A: According to Weather.com, a very strong wildfire can create a “pyrocumulus cloud.”
B: If the cloud has enough updraft, a relatively small firewhirl can grow big enough to look like a regular tornado.
B: If the cloud has enough updraft, a relatively small firewhirl can grow big enough to look like a regular tornado.
A: Cold-weather houses often have small rooms with low ceilings so they can be heated quickly.
B: They’re designed to keep in as much heat as possible.
C: Shelters in the Cold
D: Once a home has been warmed inside, it must be able to hold on to that heat.
C: Shelters in the Cold
A: According to Weather.com, a very strong wildfire can create a “pyrocumulus cloud.”
B: It looks like a thunderstorm cloud.
C: Hurricanes can demolish entire towns if they are large enough.
C: If the cloud has enough updraft, a relatively small firewhirl can grow big enough to look like a regular tornado.
C: Hurricanes can demolish entire towns if they are large enough.
It had few natural enemies.
But in the 1500s, European sailors arrived and found that the dodo was easy to hunt.
By about 1680, all the dodos had been killed.
A: The dodo was a large flightless pigeon that lived on the island of Mauritius in the Indian Ocean and is now extinct.
B: Dodo Birds are very different from Eagles.
A: The dodo was a large flightless pigeon that lived on the island of Mauritius in the Indian Ocean.
A: They have clues from rocks, fossils, ancient ice, and ocean sediment.
B: Amazingly, scientists actually know what the climate was like 18,000 years ago.
C: They’ve actually tracked changes in global temperatures over the past billion years.
B: Amazingly, scientists actually know what the climate was like 18,000 years ago.
A: They have clues from rocks, fossils, ancient ice, and ocean sediment.
B: Amazingly, scientists actually know what the climate was like 18,000 years ago.
A: They have clues from rocks, fossils, ancient ice, and ocean sediment.
A: The nine justices on the Supreme Court are part of the judicial branch of the government—our system of courts.
B: The Nine Justices
C: Throughout the country, there are local courts, state courts, and federal courts.
D: The Supreme Court is the highest court in the land—and sometimes called the “court of last resort.”
B: The Nine Justices
A: The nine justices on the Supreme Court are part of the judicial branch of the government—our system of courts.
B: Throughout the country, there are local courts, state courts, and federal courts.
C: George Washington was our country's first president.
D: The Supreme Court is the highest court in the land—and sometimes called the “court of last resort.”
C: George Washington was our country's first president.
A horizontal beam, like your back, is supported at each end by vertical posts, like your arms and legs.
A: Bridges take a lot of time to be built well.
B: The design of a beam bridge is similar to a person on all fours.
B: The design of a beam bridge is similar to a person on all fours.
A: It stands for a nation’s land, people, and government.
B: A national flag is an important symbol for most countries.
B: A national flag is an important symbol for most countries.
A: A Dinosaur (which they named "Sue") was the biggest, most complete Tyrannosaurus rex skeleton ever found.
B: A tooth fragment from another T. rex was found in one of “her” ribs. Actually, nobody knows if Sue is male or female. Also, one of Sue’s legs was broken.
B: A tooth fragment from another T. rex was found in one of “her” ribs. Actually, nobody knows if Sue is male or female. Also, one of Sue’s legs was broken.
A: The Hubble Space Telescope, or HST, has seen fuzzy blobs that might be galaxies being born.
B: HST has seen galaxies as they were billions of years ago.
C: The Hubble Space Telescope
D: By studying many galaxies of all ages, scientists can learn how they take shape.
E: Astronauts
C: The Hubble Space Telescope
A: Most flags use at least one of seven colors.
B: The popular colors are black, blue, green, orange, red, white, and yellow.
C: The US Flag is a fairly new flag.
D: Each color has certain meanings.
C: The US Flag is a fairly new flag.
Most flags use at least one of seven colors. The popular colors are black, blue, green, orange, red, white, and yellow. Each color has certain meanings.
A: Flags Colors and Meanings
B: The US Flag
A: Flags Colors and Meanings