THE HUMAN BODY
How many lungs does a healthy human typically have?
Two
Which planet is closest to the Sun?
Mercury
What is the basic unit of life?
Cell
What is molten rock called when it reaches Earth's surface?
Lava
At what temperature does water freeze in degrees Celsius?
0°C
What organ is responsible for filtering blood and producing urine?
Kidneys
What is the largest planet in our solar system?
Jupiter
What molecule carries genetic information in living organisms?
DNA
What instrument is used to detect and record earthquakes?
Seismograph
What is the center of an atom called?
Nucleus
What type of blood cells help the body fight infections?
White blood cells
What is the name of the galaxy that contains our solar system?
Milky Way
What organelle is known as the powerhouse of the cell?
Mitochondria
What is the name of the Earth's outermost solid layer?
Crust
What is the pH of a neutral solution at 25°C?
7
What is the name of the muscle that separates the chest cavity from the abdominal cavity and helps with breathing?
Diaphragm
What is the term for a massive star that explodes at the end of its life?
Supernova
How many chromosomes are typically found in a human body cell?
46
What type of plate boundary occurs when two tectonic plates collide?
Convergent boundary
What scientific law states that matter cannot be created or destroyed in a chemical reaction?
Law of Conservation of Mass
What is the name of the tiny functional units in the kidneys responsible for filtering blood?
Nephrons
What is the name of the boundary around a black hole beyond which light cannot escape?
Event horizon
What type of cell division produces reproductive cells with half the usual number of chromosomes?
Meiosis
What is the name of the point on Earth's surface directly above an earthquake's focus?
Epicenter
What is the term for the energy required to start a chemical reaction?
Activation energy