Biology
This organ pumps blood throughout your body.
the heart
Water freezes into this state of matter.
a solid
A thermometer changes from 10°C to 16°C. The temperature increased by this many degrees.
6 °C
This force pulls objects toward Earth.
gravity
This planet is closest to the Sun.
Mercury
These tiny structures inside plant cells allow plants to make their own food.
chloroplasts
This tool is used to measure the volume of a liquid.
graduated cylinder
A student runs 200 meters in 40 seconds. What is the student's average speed?
5 m/s
This type of circuit has only one path for electricity to travel.
series circuit
Earth's seasons are caused by this.
earth's tilted axis
This process allows plants to make glucose using sunlight, water, and carbon dioxide.
photosynthesis
Vinegar reacts with baking soda to produce this gas.
carbon dioxide
A rock has a mass of 180 g and a volume of 60 cm³. What is its density.
3 g/cm³
According to Newton's First Law, an object at rest will stay at rest unless acted on by this.
This type of rock forms when molten rock cools and hardens.
igneous
This body system removes carbon dioxide from your body and brings in oxygen.
the respiratory system
A substance has a density of 8 g/cm³. If its volume is 5 cm³, this is its mass.
40 grams
A bacteria population doubles every hour. Starting with 25 bacteria, this is the population after 4 hours.
400 bacteria
A ball rolls down a hill. Its potential energy changes into this type of energy.
kinetic energy
This type of plate boundary forms deep ocean trenches when one plate sinks beneath another.
convergent boundary (subduction zone)
Red blood cells have a biconcave (flattened) shape because it helps them do this more efficiently.
carry oxygen and/or move through tiny blood vessels
Atoms form chemical bonds because they become more stable by doing this.
filling their outer shell/valence shell
A car travels 150 miles at 50 mph and then 50 miles at 25 mph. This is the total travel time.
5 hours
A 2-kg object accelerates at 4 m/s². According to Newton's Second Law, this is the net force acting on it.
8 newtons
Lunar eclipses do not happen every month because of this feature of the Moon's orbit.