Water
What is the process by which water vapor turns into liquid water?
Condensation
What do we call the imaginary line that runs around the Earth’s middle?
The Equator
What is the speed of light in a vacuum?
Approximately 299,792 km/s (or ~300,000 km/s)
What is the smallest unit of life?
The cell
What is the chemical symbol for gold?
Au
What percentage of Earth’s water is freshwater?
About 2.5%
Earth’s rotation on its axis causes what daily phenomenon?
Day and night
What simple machine consists of a rigid bar that pivots on a fulcrum?
A lever
What organ in the human body is responsible for pumping blood?
Heart
What do we call a substance made of only one type of atom?
An element
What is the term for water stored underground in soil and rock?
Groundwater / Aquifer
What is Earth’s outermost solid layer called?
The crust
What unit is used to measure electric current?
Ampere (Amp)
What part of a plant carries out photosynthesis?
Chloroplast
What pH value indicates a neutral substance?
7
At what temperature does pure water boil at sea level?
100°C or 212°F
What gas makes up most of Earth’s atmosphere?
Nitrogen (about 78%)
What force keeps us on the ground?
Gravity
What molecule contains genetic information?
DNA- Deoxyribonucleic Acid
What gas do humans exhale that plants use in photosynthesis?
Carbon dioxide (CO₂)
Movement of water through a semipermeable membrane from a high concentration to a low concentration
Osmosis
The layer of Earth made of hot, flowing rock beneath the crust.
Mantle
The process that changes liquid water into water vapor.
Evaporation
Organelle that controls cell activities and holds DNA.
Nucleus
The smallest particle of an element that keeps its properties.
An atom