The force that opposes motion whenever two surfaces rub together.
What is friction?
The state of matter that keeps a fixed shape and a fixed volume.
What is a solid?
The lightest element, which combines with oxygen to make water.
What is hydrogen?
A body structure such as the heart, lungs or stomach.
An element on the periodic table's "staircase" that behaves partly like a metal and partly like a non-metal.
What is a metalloid?
The process that breaks food down into nutrients small enough to absorb.
What is digestion?
The energy and power we capture from the Sun.
What is solar?
The basic unit of inheritance passed from parent to child.
What is a gene?
The scientific word for any living thing.
What is an organism?
The instrument used to measure temperature.
What is a thermometer?
The process that happens to food after they are digested.
What is absorption?
The verb for sugar disappearing evenly into hot water.
What is dissolve?
The regrowth of a lost body part, as a lizard does with its tail.
What is regeneration?
A tiny structure inside a cell, such as the nucleus or a mitochondria.
What is an organelle?
An icy ball of dust that grows a glowing tail as it swings close to the Sun.
What is a comet?
The chemical change when a fuel reacts rapidly with oxygen, giving off heat and light.
What is combustion?
In salt water, the water plays this role.
What is solvent?
The element making up about 78% of the air around you.
What is nitrogen?
A living thing too small to see without a microscope.
What is a mircoorganism?
The rock type formed when existing rock is changed by intense heat and pressure.
What is metamorphic?
The process of a gas turning straight into a solid with no liquid in between, like frost forming on a cold window.
What is deposition?
The property that results in far more sugar dissolving in hot tea than iced tea.
What is solubility?
A marker on a pathogen that the immune system spots as foreign.
What is an antigen?
In chemistry, this word doesn't mean "pesticide-free" but instead describes any compound built around carbon.
What is organic?
The change in body form as a caterpillar becomes a butterfly.
What is metamorphosis?