Physical Science
What are the three common states of matter?
Solid, liquid, and gas
What is temperature?
A measure of how hot or cold something is
What type of energy comes from the Sun?
Radiation
What is an eclipse?
When one object in space blocks the light of another
What is an ecosystem?
A community of living and nonliving things that interact in an environment
In which state of matter do atoms move the fastest?
Gas
What is pressure?
The force of particles pushing against an object or surface
What is radiation?
Energy that travels in waves through space
What are moon phases?
The different shapes of the Moon as seen from Earth
What are natural resources?
Materials from Earth that living things need, such as water, air, and food.
In which state of matter do atoms move the slowest?
Solid
What happens to a solid when it is heated?
It can melt into a liquid
What does the Sun provide to Earth?
Energy (light and heat)
What causes tides on Earth?
The gravitational pull of the Moon
What is one example of a human activity that affects the environment?
Cutting down trees (deforestation), pollution, or building cities
What happens to the movement of atoms when heat is added to a substance?
The atoms move faster
What is the change of state called when a liquid turns into a gas?
Evaporation
What happens when the Sun’s energy reaches Earth’s surface?
It is absorbed and warms the surface
What system includes the Sun, Earth, and Moon?
The Sun–Earth–Moon system
What is competition in an ecosystem?
When organisms try to get the same limited resources, like food or water
What is the name of the theory that explains how particles move in solids, liquids, and gases?
Kinetic Theory
What can cause matter to change from one state to another?
Changes in temperature or pressure
What parts of Earth are warmed by the Sun’s energy?
The surface and the atmosphere
What is the main source of light in the Sun–Earth–Moon system?
The Sun
Can human activities have positive effects on the environment?
Yes, for example planting trees or recycling