Leaves ...... in the forest and become part of the soil.

Composting helps food scraps ....... into rich soil for plants.

Plastic takes a very long time to ........ in nature.

A test that people do to find out how things work

The science class did an ...... to see which paper airplane design flew the farthest.

Doctors run ....... to test new medicines.

My sister did an ........ to see which plant food helps flowers grow best.

When there is a lot of moisture in the air

The air feels ...... and sticky on hot summer days.

Rainforests are very ....... because of all the water in the air.

It's hard to dry clothes outside when the weather is ........ .

A fungus that grows on old food

Green ...... grew on the old bread in the kitchen.

....... can grow in damp places like bathrooms if they're not cleaned often.

Some types of ........ are used to make medicines like penicillin.

Small, seed-like structures that are made by plants that don't reproduce using flowers

Mushrooms release tiny ...... that grow into new mushrooms.

Ferns spread their ....... on the underside of their leaves.

The wind can carry ........ for long distances to help plants spread.

To hold something inside it

The box ...... all my favorite toys.

Our bodies ....... mostly water.

The zoo has a special area to ........ the lions safely.

To be in charge of something

The remote ...... lets you change TV channels easily.

It's important to ....... your anger and not yell at others.

Farmers try to ........ pests that might damage their crops.

The area where something lives

We should take care of our ...... by not littering.

Fish need a clean water ....... to live in.

The classroom ........ should be quiet so students can focus.

To find out more about something

Detectives ...... crimes to find out what happened.

Scientists ....... how plants grow in space.

We need to ........ why the car won't start.

To cover a wide area

Butter ...... easily on warm toast.

News can ....... quickly on the internet.

Some plants ........ their seeds by attaching them to animal fur.

A place where an organism can live and flourish

A forest is the natural ...... for many animals like deer and bears.

Coral reefs are an important ....... for many sea creatures.

Zoos try to create ........ that are similar to where animals live in the wild.

To take something over without permission

Ants might ...... your picnic if you leave food out.

In history, some countries tried to ....... others to take their land.

Weeds can quickly ........ a garden if you don't pull them out.

The number of living things that are in an area

The ...... of our town grew when a new factory opened.

Scientists study animal ....... to see if they are healthy.

A large ........ of butterflies visited the flower garden.

A group of living things that are very similar and can reproduce

There are many different ...... of birds in the rainforest.

Some ....... of animals, like pandas, are endangered.

Each ........ has special traits that help it survive in its environment.

When something is at risk of danger

Some animals are ...... by loss of their forest homes.

The small town felt ....... by the approaching storm.

Polar bears are ........ by melting ice in the Arctic.

When something is steady

It takes practice to ...... on one foot.

Eating a ....... of different healthy foods is good for you.

Nature tries to keep a ........ between predators and prey.

A contest

The school held a spelling ...... to see who was the best speller.

Plants in a garden may be in ....... for sunlight and water.

Friendly ........ in sports can be fun and help you improve.

To meet for the first time

The teacher will ...... the new student to the class.

Scientists sometimes ....... new species to an area to control pests.

It's polite to ........ yourself when you meet someone new.

When people or animals move from one place to another

Birds' ...... south for the winter helps them find warmer weather.

The ....... of people to cities for jobs can change how places grow.

Salmon make an amazing ........ upstream to lay their eggs.

To live and grow in an area naturally

Oak trees are ...... to many parts of North America.

Kangaroos are ....... to Australia and not found wild anywhere else.

It's important to plant ........ flowers that local insects can use.

An exciting experience

Going camping in the woods was an exciting ......

Reading a good book can take you on an ....... in your mind.

The children had an ........ exploring the old attic.

Sections of land near an ocean

Many people like to visit ...... towns for their beaches.

....... areas often have different weather than places inland.

Some animals, like seagulls, are adapted to live in ........ regions.

A tool with a magnet that can show you directions

Hikers use a ...... to find their way in the woods.

A ....... needle always points north because of Earth's magnetic field.

Before GPS, sailors relied on a ........ to navigate across oceans.

The process of figuring out how to get somewhere

Pilots use special ...... tools to fly planes safely.

Stars helped early sailors with ....... across the seas.

Good ........ skills can help you find your way in a new city.

A safe place where boats can dock

Large ships dock at the ...... to unload their cargo.

Our class took a field trip to see the busy ....... in action.

A ........ city often has many jobs related to shipping and trade.

A collection of jewels, money, or other valuable items

Pirates in stories often search for buried ......

Old family photos can be a real ....... to keep.

The museum displayed ........ found in an ancient tomb.

A piece of information with numbers, pictures, and symbols

The teacher used a ...... to show how plants grow over time.

We made a ....... of our favorite ice cream flavors in class.

Doctors use growth ........ to track how tall children are getting.

When you find things

The ...... of a new dinosaur fossil excited the scientists.

Columbus's ....... of America changed history.

My little brother made a fun ........ when he found a frog in our backyard.

To go somewhere to search for new places or things

Astronauts ...... space to learn about other planets.

We like to ....... the woods behind our house on weekends.

Scientists ........ new ways to make medicines that can help people.

To tell what you think something means

The tour guide can ...... the ancient writing on the stone walls.

It's hard to ....... what babies want when they cry.

Musicians ........ songs differently when they play them.

Explains the symbols next to a map

The map's ...... showed which symbols meant mountains or rivers.

We checked the ....... to understand what all the colors on the chart meant.

The ........ on the treasure map explained where X marked the spot.

Somebody who studies old buildings and civilizations

The ...... carefully dug up old pottery from the ground.

An ....... studies how people lived long ago.

The museum hired an ........ to examine the new artifacts.

Something that a human made a long time ago

The museum displayed an ...... from ancient Egypt.

The old coin was a valuable ....... from the Roman Empire.

Archaeologists found a stone ........ that early humans used as a tool.

The type of money used in an area

Each country has its own ...... to buy things.

We had to exchange our dollars for euros, the ....... used in France.

The store wouldn't accept foreign ........, only U.S. dollars.

A large sailing ship used hundreds of years ago

The pirate ship was a large ...... with many sails.

Spanish ....... carried treasure across the ocean long ago.

The museum had a model of a ........ that showed how big these old ships were.

Someone who buys and sells items

The ...... at the market sold fresh fruits and vegetables.

In olden days, ....... traveled to different towns to sell their goods.

The spice ........ had many colorful and fragrant items in his shop.

A region controlled by another country

The ants built a large ...... under the sidewalk.

England started a ....... in America many years ago.

The ........ of penguins huddled together to stay warm.

To look closely at something

The doctor will ...... your throat if it hurts.

Students had to ....... leaves under a microscope in science class.

The jeweler used a special tool to ........ the diamond closely.

To keep something safe from harm

The museum works hard to ...... old paintings.

Canning fruits and vegetables helps ....... them for a long time.

We need to ........ forests so animals have places to live.

A path to go to someplace

The bus takes the same ...... to school every day.

Pilots plan their ....... carefully before flying a plane.

The parade ........ went right past our house.

To exchange one thing for another

Kids often ...... cards or stickers with their friends.

Long ago, people would ....... goods instead of using money.

The two baseball teams decided to ........ players.

To move faster

Cars ...... when the light turns green.

Riding your bike downhill makes you ....... .

Rockets need a lot of fuel to ........ into space.

The measurement of how tall something is

The giraffe's ...... makes it easy for it to eat leaves from tall trees.

We measured everyone's ....... in class to see who grew the most.

The ........ of the mountain made it challenging to climb.

To find out something's size, weight, or amount

We use a ruler to ...... how long things are.

Cooks ....... ingredients carefully when baking a cake.

Scientists ........ the temperature every day to track weather patterns.

Movement

The ...... of the swing made the little girl laugh.

Newton studied the ....... of apples falling from trees.

The ........ of the ocean can make some people feel seasick on boats.

How fast something is going

The ...... limit on the highway is higher than in the city.

Cheetahs can run at an amazing ....... when chasing prey.

The ........ of light is faster than anything else in the universe.

An amount that is usual for a group

The ...... temperature in summer is much warmer than in winter.

An ....... adult has 32 teeth.

The teacher calculated the ........ score on the math test.

The amount of space between two things

The ...... between Earth and the moon is about 239,000 miles.

I can run a short ....... quickly, but I get tired on long runs.

The sign showed the ........ to the next town.

The speed at which something is happening

The heart ...... goes up when you exercise.

Water flows out of the faucet at a steady ....... .

The ........ at which plants grow depends on sunlight and water.

Gives size comparisons

The ...... on the map showed that one inch equaled 100 miles.

We used a ....... to weigh our science project.

Doctors use a pain ........ to understand how much something hurts.

To figure out a problem

It took a long time to ...... the difficult puzzle.

Detectives work hard to ....... mysteries.

In math class, we learn how to ........ problems with numbers.

Someone who travels in space

The ...... floated inside the space station.

It takes years of training to become an ....... .

The ........ collected rock samples on the moon.

To send something up into the air

The rocket will ...... into space tomorrow.

Birds ....... themselves into the air when they start to fly.

We watched the ship ........ from the dock into the water.

To move around a sun, moon, or planet in a predictable pattern in space

The moon ...... around the Earth every 28 days.

Satellites ....... the Earth to help with communication and weather forecasts.

The planets in our solar system ........ around the sun.

A large body that orbits around the sun or another star

Mars is the fourth ...... from the sun in our solar system.

Earth is the only ....... we know of with life on it.

Jupiter is the largest ........ in our solar system.

How something turns on its axis

The Earth's ...... causes day and night.

The ....... of a Ferris wheel gives everyone a turn at the top.

Figure skaters spin in a fast ........ on the ice.

The most an object can hold

The ...... of our school bus is 40 students.

This water bottle has a ....... of one liter.

The ........ of the elevator is ten people.

Something that never changes

The buzzing of bees was a ...... sound in the garden.

Gravity is a ....... force that keeps us on the ground.

The ........ beeping of the alarm woke everyone up.

To stop something after a set time or a set amount

There's a time ...... of 30 minutes to finish the test.

Parents often ....... how much TV their kids can watch.

Speed ........ help keep drivers safe on the road.

A slowing force

The ...... of the water makes it harder to swim fast.

Germs can build up ....... to medicines over time.

The ........ in the exercise band helps make your muscles stronger.

The use of science to solve problems

Computers are an important ...... in schools today.

New ....... helps cars use less gas.

Scientists use advanced ........ to study tiny atoms.