Physics
Biology
Ecology
Astronomy
Geology
100

Planets stay in their orbit around the Sun due to this universal force of attraction

Gravity

100

Large fingers and attached earlobes are examples of these kinds of traits

Inherited Traits

100

Many species of salmon swim north in a large group to lay their eggs during a process called

Migration

100

This the word to given to the Earth spinning around on its axis

Rotation

100

This powerful force can erode mountains to create large canyons

Water

200

Riding a bike requires this type of energy

mechanical energy

200

The part of the butterfly life cycle in which the caterpillar appears is called this stage

Larva

200

Temperatures in the atmosphere cool down water vapor, turning back into liquid during this process

Condensation

200

People who live along this imaginary line have equal hours of day and night all year long

The Equator

200

This type of erosion most frequently happens in the desert to create unique rock features.

Wind Erosion

300

This type of matter can change its shape but always stays the same amount of volume

Liquid

300
The zebra population have evolved this adaptation to help confuse predators when they run

Stripes

300

During photosynthesis, plants make this type of food for themselves to survive, along with oxygen for us to breathe

Sugar

300

This season provides this least amount of daylight for the Northern Hemisphere

Winter

300

The Earth is made up of this many layers 

3

400

This type of simple machine helps a construction crane lift massive objects

Pulley

400

Rosebushes have adapted this type of self defense to keep away predators

Thorns

400

These living things provide nutrients in the soil for plants and trees to use to grow

Decomposers

400

The 4 seasons that we experience happens because the Earth revolves in this way.

Tilted

400

The grinding back and forth of tectonic plates causes these natural disasters to occur

Earthquakes

500

The reason that a skateboard eventually stops on the pavement is due to this force 

Friction

500

Exercise is necessary to help keep this major organ of the body functioning correctly

Heart

500

Propeller shaped seeds (such as the maple) are dispersed to other areas by this

Wind

500

The moon takes approximately this long to make one revolution around the Earth.

1 month

500

One positive effect of a volcanic eruption

New land created / Enriching the soil

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