Biology
Chemistry
Physics
Geology
Random
100
What is the green pigment in leaves that absorbs light energy for photosynthesis?
Chlorophyll
100
What state of matter has a fixed shape and a fixed volume?
Solid
100
What force pulls objects downward toward the center of the Earth?
Gravity
100
What do we call molten rock while it is still underneath the Earth's surface?
Magma
100
What is the primary source of energy for almost all food chains on Earth?
The Sun
200
What part of a plant cell provides structural support and keeps the cell rigid?
The cell wall
200
What do we call a material made of only one type of atom?
An element
200
What type of force opposes motion when two surfaces rub against each other?
Friction
200
What geological event occurs when tectonic plates suddenly slip past each other, releasing energy in waves?
An earthquake
200
What famous scientist is credited with discovering gravity when an apple fell from a tree?
Sir Isaac Newton
300
What are the three main things a plant needs to carry out photosynthesis?
Carbon dioxide, water, and light (energy)
300
What happens to the mass of a substance when it undergoes a physical change, like melting?
It stays exactly the same
300
Name two types of energy that are released when wood burns in a campfire.
Light energy and thermal (heat) energy
300
What does this image show?
Pangea
300
Why is it important to repeat measurements multiple times during a lab investigation?
To identify anomalies, improve reliability, and calculate an accurate average
400
Which specialized animal cells have a long, thin axon to carry electrical impulses quickly over long distances?
Nerve cells (or neurons)
400
What is the difference between a mixture and a compound?
In a mixture, substances are physically together but not chemically bonded; in a compound, elements are chemically joined
400
What happens to the air resistance acting on a falling object as its speed increases?
The air resistance increases
400
What scale do scientists use to measure the total amount of energy released by an earthquake (its magnitude)?
The Richter Scale
400
What is the standard SI unit used to measure electrical current?
Amperes (or Amps / A)
500
Write down the word equation for aerobic respiration in living organisms.
Glucose + Oxygen -> Carbon dioxide + Water (+ Energy)
500
Explain how chromatography separates different dyes in ink.
The dyes have different solubilities and move along the paper at different speeds
500
If it is summer in the Northern Hemisphere, what season is it in the Southern Hemisphere, and why?
Winter, because the Southern Hemisphere is tilted away from the Sun
500
How do ocean trenches form?
Convergent plate boundaries where one plate slides under the other
500
Why does a balloon inflated with helium float in the air, while a balloon inflated with your breath sinks to the ground?
Helium gas is less dense than the surrounding air, whereas the carbon dioxide and warm air from your breath are more dense