Grade 4 Science Quiz Bee Review 3

Vocabulary practice flashcards covering Life Science, Physical Science, Earth Science, Environment, Astronomy, and Human Biology.

Thermometer

An instrument used to measure the temperature of the air, or how hot or cold the air is.

Hypothesis

A guess that scientists test in an experiment.

Chemical change

A change that produces new substances, such as burning wood to make ash and smoke.

Physical change

A change where the material remains the same substance, such as ice melting into water.

Atmosphere

The layers of air surrounding the Earth that protect it from harmful rays.

Precipitation

Moisture that falls from the sky in forms such as rain, snow, and hail.

Erythromycin

An antibiotic medicine doctors give to help fight bacterial infections.

Chlorophyll

A green pigment in leaves that helps plants produce food using sunlight.

Photosynthesis

The process plants use to make food from sunlight, water, and carbon dioxide.

Bioluminescence

A natural process that allows organisms, like fireflies, to glow at night.

Decomposer

An organism, such as a fungus, that breaks down dead plants and animals.

Vascular plants

Plants, such as trees, that contain specialized tubes to carry water and nutrients.

Non-vascular plants

Plants, like mosses, that lack specialized tubes for transporting water.

Gene

A unit that carries instructions determining how living things look and grow.

Classification

The method scientists use to group animals into categories like mammals, birds, fish, reptiles, and amphibians.

Pollination

The transfer of pollen from one flower to another, often carried out by insects like bees.

Density

The measure of mass per unit volume; an object sinks in water if it has a higher density than water.

Conductivity

The property of materials, such as metals, that allows electricity to pass through them easily.

Insulator

A material, like rubber, through which electricity cannot pass.

Conductor

A material, like copper wire, that allows electricity to pass through easily.

Refraction

The bending of light, which can cause an object like a pencil to appear bent in a glass of water.

Reflection

The bouncing back of light, enabling mirrors to display clear images.

Electrical circuit

A complete closed path through which electric current travels to power devices like flashlights.

Anemometer

An instrument designed to measure wind speed.

Rain gauge

A meteorological tool that collects and measures the amount of rainfall.

Erosion

The wearing away of land surfaces, such as shoreline loss caused by strong waves.

Geology

The scientific study of rocks and the Earth's layers.

Hydrosphere

All the water bodies found on Earth, including oceans, rivers, and lakes.

Geosphere

The solid, non-living parts of the Earth, including rocks and mountains.

Biosphere

The global sum of all living things on Earth.

Weathering

The natural process through which rocks break down into soil.

Carbon footprint

The environmental impact of an individual or activity, increased by consuming excess electricity.

Orbit

The curved path followed by the Earth as it moves around the Sun.

Rotate

The spinning movement of the Earth on its axis, completing one full turn every 24 hours.

Revolution

The complete journey of the Earth around the Sun, lasting 365 days.

Eclipse

An astronomical event where light is blocked, such as when the Moon blocks the Sun's light in a solar eclipse.

Velocity

A measurement indicating both the speed and the direction of a moving object.

Acceleration

The rate at which an object speeds up, such as a roller coaster moving faster down a hill.

Momentum

The quantity of motion possessed by a moving body; heavier moving objects like trucks possess more than bicycles.

Balanced force

Equal forces acting on an object that cause it to remain stationary, like a book resting on a table.

Unbalanced force

A force that causes an object to move or accelerate, such as kicking a soccer ball.

Symbiosis

A relationship where two different organisms live closely together.

Mutualism

A symbiotic relationship where both organisms benefit, such as bees pollinating flowers.

Commensalism

A symbiotic relationship in which one organism benefits while the other is unaffected, like a bird nesting in a tree.

Parasitism

A relationship where one organism lives off another and causes it harm, like a tick biting a dog.

Biodegradation

The natural breakdown of waste materials over time.

Incubator

An apparatus designed to keep newborn babies warm and safe.

Crust

The solid, outermost surface layer of the Earth where life resides.

Mantle

The intermediate layer of the Earth situated directly beneath the crust.

Core

The extremely hot central layer of the Earth.

Glacier

A huge mass of ice slowly moving across a landmass.

Tsunami

A giant sea wave triggered by an undersea earthquake.

Habitat fragmentation

The division of continuous wildlife habitats into smaller pieces, frequently caused by road construction.