Forces and Electricity
What force causes objects to fall to Earth?
gravity
What type of change does not create a new substance?
physical change
What tool measures air pressure?
Barometer
What body system includes the heart and blood?
circulatory system
What force pulls planets and moons into orbit?
gravity
What happens when like electric charges are near each other?
they repel
What evidence shows a chemical change has happened?
gas, color change, temperature change, new substance
What is the difference between weather and climate?
weather is daily and climate is long term
What is the main function of roots?
absorb water and nutrients
What movement of Earth causes day and night?
rotation
What tools can separate iron from other materials?
magnet
Is dissolving salt in water a physical or chemical change?
physical
Why do dark clouds often bring rain?
They hold more water droplets
What organ produces enzymes that help digestion?
pancreas
Why does the Moon have phases?
we see different amounts of its sunlit side
Why do balloons sometimes stick to walls after being rubbed?
static electricity
Why is rusting considered a chemical change?
a new substance forms
What causes wind to form?
Uneven heating of Earth's surface
How do Earth's systems work together in the water cycle?
atmosphere, land, and water interact
Why do stars appear to move across the sky at night?
Earth's Rotation
If two balloons push apart, what can you conclude?
they have the same type of charge
Why can chemical changes usually not be reversed easily?
The original substances are changed into new ones
Why are coastal areas usually more humid than inland areas?
Nearby water increased evaporation
Why are systems made of parts that work together instead of alone?
each part has a specific function
Why is Earth able to support life but most other planets cannot?
it has liquid water, suitable temperature, and an atmosphere