Biology
What is the powerhouse of the cell?
Mitochondria
Chemical formula for water?
H2O
What is gravity?
The force that pulls objects toward each other?
Skin
What is the layer of air that surrounds the planet we live on?
The heart
What are atoms
Why do we see lightning before we see thunder?
Light travels faster than sound
How many bones are in the human body?
206
The crust, mantle, and the core
They speed up chemical reactions by lowering activation energy
What is a molecule?
2 or more atoms joined together
Why do objects fall faster on Earth than on the Moon?
Earth has stronger gravity than the moon because the Earth has more mass
Help us breathe by taking in oxygen and letting out CO2
What is the term for a large piece of land that moves very slowly on the Earth's surface?
How do plants get their energy
Photosynthesis
Why does salt dissolve in water?
solute is water
solvent is the salt
The light bounces back, or reflects, in the opposite direction.
How many chambers does the heart have?
4
What type of rock forms from the cooling of molten rock?
Igneous rock
2 steps of protein synthesis
Transcription and then Translation
Why do some metals like iron rust when they are left outside?
They are exposed to oxygen and water
When ice freezes, its molecules spread which makes it less dense than liquid water.
What type of blood vessels carry blood away from the heart?
Arteries
When tectonic plates in the crust move and release energy