Scientific Method
What is an educated guess or testable prediction called?
A hypothesis
What star is at the center of our solar system?
The Sun
What green substance in plant leaves helps them make food from sunlight?
Chlorophyll
What are the three main states of matter?
Solid, liquid, and gas
What is the largest mammal on Earth?
The Blue Whale
What step of the scientific method uses your 5 senses to gather information?
Observation
How long does it take Earth to orbit (revolve around) the Sun once?
1 year / 365 days
What process do plants use to turn sunlight, water, and carbon dioxide into food?
Photosynthesis
What force pulls objects toward the center of the Earth?
Gravity
What hard structure covers the outside of an insect's body instead of internal bones?
An exoskeleton
In an experiment, what do scientists call the one factor that is intentionally changed?
A variable
What is the outer, rocky layer of the Earth that we stand on called?
The crust
Animals that eat only plants are called what?
Herbivores
What form of energy is produced when an object vibrates?
Sound energy
True or False: Sound travels faster through water than through air.
True
What do scientists use to organize, display, and read the data they collect?
A graph, chart, or table
What causes day and night on Earth?
Earth's rotation on its axis
What is the basic unit of life that all living things are made of?
Cells
What process occurs when a liquid heats up and turns into a gas?
Evaporation
What organ in the human body pumps blood through the circulatory system?
The heart
What final step comes after analyzing your data to explain what happened in an experiment?
Drawing a conclusion
Name the process where rocks and soil are broken down and washed away by wind or water.
Weathering and Erosion
What do we call a network of interconnected food chains in an ecosystem?
A food web
What type of material allows heat or electricity to flow through it easily?
A conductor
What natural phenomenon is caused by static electricity discharging in the sky?
Lighting