1. Summer
   Vernal
2. Winter
   Autumn

The season known as fall, where temperatures cool and leaves change color, may also go by the name "autumn." Though the most common name for the year's third season is "fall," the word "autumn" pre-dates it by 300 years!

1. A pencil
   A paper clip
2. A popsicle
   A stamp

Magnets can be a lot of fun to play with to see what kinds of things will be pulled toward its forces. A paper clip is a small object made out of metal—primarily iron—which is attracted to the magnet's power.

1. Heart
   Kidneys
2. Lungs
   Brain

A mammal's respiratory system works by bringing oxygen into the lungs, where it is converted into carbon dioxide and breathed out through the nose and mouth. There are other systems in the body that help facilitate this, but the lungs are an integral part of helping a mammal to breathe.

1. Skin
   Eyes
2. Arms
   Hair

You might think of all organs being internal, but in fact, the skin is the body's largest organ and is exposed on the outside. Scientists say our skin makes up about eight pounds of the weight we carry around.

1. Apple
   Broccoli
2. Cookie
   Milk

Broccoli is a green, tree-shaped vegetable that most kids (and even some adults) don't much care for. Part of the cabbage family, broccoli was actually first created by human beings years ago as a result of cultivating the plant from different strains of cabbage and kale.

1. Rabbit
   Turtle
2. Sloth
   Snail

Unlike the ending of "The Tortoise and the Hare," a turtle (or a sloth or a snail) is unlikely to beat the fast-footed rabbit. The fastest type of rabbit out there has been tracked going as fast at 45 miles per hour!

1. A place where plants and animals live.
   A place where nothing can live.
2. A place where people go on vacation.
   A place where it's either too hot or too cold.

Habitats are natural environments of different types throughout the world that provide a home for plants, animals and other organisms. Several types exist including the savanna, desert, aquatic, forest and grasslands.

1. A dog
   A kite
2. A car
   A motorcycle

Wind or airflow can help a kite stay in the air, especially on a windy day! Changes in air pressure help lift the kite into the air while thrust and drag move the body of the kite back and forth.

1. A tadpole
   A bullfrog
2. A kid
   A joey

Frogs go through many stages of metamorphosis, including the stage after hatching when they are called tadpoles. Tadpoles live, and continue to grow, in an aquatic environment.

1. Attraction
   Evaporation
2. Precipitation
   Evacuation

Precipitation is a term used in the study of weather to describe water that falls from the sky. That may take the form of rain, sleet, snow or hail, all types of water in different forms.

1. Mercury
   Moon
2. North Star
   Sun

Believe it or not, the sun is also a star. Some people might think of it as a planet, due to its size, but it serves as the star in the midst of our solar system. Scientists know it as a "yellow dwarf star."

1. A house
   A nest
2. A cage
   A tank

Birds in the wild rely on nests made of natural materials they can find to provide shelter for themselves. They also use nests to lay eggs and raise their babies.

1. Paleontologist
   Radiologist
2. Biologist
   Chemist

A biologist makes the study of life their life's work. That means they may study everything from plants and animals to even bacteria under a microscope. Biologists are particularly interested in how living things interact with other living things and the ecosystems around them.

1. Newspaper
   Soda can
2. Water bottle
   Hamburger

Recycling is the process of turning old materials, such as newspapers, bottles or cans, into new materials that can be reused. Without recycling, everything we used would be thrown into the trash and wind up in a landfill.

1. Muscles
   Plasma
2. Vessels
   Cartilage

Muscles aid us in movement by contracting and helping our bones move. The human body has more than 600 of these, accounting for almost half of our body weight.

1. Artifacts
   Pollutants
2. Components
   Humans

Pollutants are substances or conditions that get into our air, water and soil and create harmful or unwanted effects. They may cause damage to the environment or human beings.

1. Nothing.
   It evaporated.
2. It condensed.
   It rained.

You can't really see it happening, but water that sits in one place can turn into a gas, evaporating and virtually disappearing from the cup. This can occur whether the water is cold or warm.

1. Dirt
   Water
2. Plants
   Meat

Herbivores are plant eaters and their digestive systems are configured to eat and digest only plants. They are not interested in eating meat, leaving that to a class of animals known as carnivores.

1. Condensation
   Gravity
2. Pliability
   Chemistry

The force of gravity is what helps Rachel proceed down the slide. Gravity is what pulls our bodies down toward the center of the Earth and keeps us from floating up into the air.

1. Speedometer
   Barometer
2. Odometer
   Thermometer

A thermometer can help measure the temperature of a variety of things including the air around us, liquids such as water and even solid matter such as food. We can also use a thermometer to take our own temperatures if we're feeling sick.

1. Desert
   Arctic
2. Tundra
   Rainforest

The arctic's habitat is one of the world's coldest, due in part to its location above the Arctic Circle. It is home to cold-weather animals and frigid and snowy conditions.

1. Constellation
   Hibernation
2. Condensation
   Elimination

Hibernation is a period of deep sleep animals enter into, particularly during the winter, when they stay indoors and don't have to forage for food. For many animals, this allows them to survive harsh, cold conditions.

1. Eggs
   Rice
2. Carrots
   Cookies

Many different types of foods come from animals including different types of meat, eggs and even milk (from cows). We get other types of foods like rice and carrots from plants.

1. Solid
   Liquid
2. Gas
   Vapor

Sure, ice cubes are made from water, which is a liquid, but once frozen, they change to a solid state. They float in our water glass because they are less dense than the liquid.

1. Insects
   Grasses
2. Rocks
   Clouds

You may think all clouds look the same, but in fact they carry different names that represent their shape. Cumulus clouds resemble a pile, stratus clouds looks like layers and cirrus clouds are curly in shape.

1. 6
   8
2. 12
   10

All insects have six legs, divided among three areas of their bodies including the head, thorax and abdomen. Some things you might consider insects, like ticks or centipedes, just don't qualify: too many legs!

1. Bands
   Poles
2. Clips
   Lots

The ends of a magnet bear a resemblance, at least in name, to the opposite ends of planet Earth. They are called the North and South poles. Magnetic poles of the same type repel one another, while opposite poles attract.

1. The elevation of the ground.
   The pull of the moon.
2. The position of clouds.
   Light blocked by an object.

Shadows are caused when an object blocks the light being provided by the sun. If you stand on the sidewalk with your back to the sun, you will be able to observe your shadow appear in front of you!

1. Rocks
   Magazines
2. Plastic
   Clouds

Natural resources are all of the different types of things that can be found freely in nature. That might include soil, rocks, air, plants and animals.

1. Core
   Crust
2. Mantle
   Grass

The outer layer of the Earth is known as its crust. The crust is made up of different kinds of rocks and serves as a type of shell for the interior layers of the planet.

1. The shape of a stream or river.
   The shape of the container it's in.
2. The same shape its solid takes.
   The shape of a 3D object.

Think about pouring orange juice into a glass. That liquid will form into the shape of the container. It will not take on a shape of its own. These liquids will not, however, change in volume.

1. Cold
   Warm
2. Hot
   Frozen

Scientists believe the temperature at the center of the Earth is similar to the temperature you'd find on the surface of the sun. The Earth's center is believed to be at least 10,000 degrees Fahrenheit.

1. 24 hours
   365 days
2. Two weeks
   60 minutes

It takes the Earth an entire year to travel its orbit in revolution around the sun. The sun's gravitational pull helps make this possible as the Earth continues moving forward.

1. Weeds
   Roots
2. Flowers
   Leaves

The process of photosynthesis is what enables plants to make their own food in their leaves. Chlorophyll in the plant's leaves uses water, sunlight and carbon dioxide to help feed itself.

1. Three
   Four
2. Six
   Seven

There are four named oceans on the planet we know as Earth. That includes the Pacific Ocean, Atlantic Ocean, Indian Ocean and Arctic Ocean. The National Ocean Service explains that 97% of the Earth's water is found in one of these oceans.