Practice MP3 Knowledge

A skydiver jumps out of an airplane and begins to freefall. Once he reaches maximum velocity, which statement below would best describe the forces acting on the skydiver? MS-PS2-2

• Forces are unbalanced. Gravity pulls the skydiver, causing him to accelerate ever faster towards the ground.
• Forces are balanced. Since the skydiver is in freefall, he is experiencing no gravity at all, so no forces are acting on him.
• Forces are balanced. The pull of gravity is being countered by the friction of the air, so the skydiver, though falling, FEELS weightless.
• Forces are unbalanced. The skydiver is hitting the inertia of the air, which he can't push through so his fall slows.

The image below shows one of the phases of the moon. Which phase is it, and what kind of tide would we expect to see with this phase? MS-ESS1-1 MS-PS2-4

• Waxing Crescent, spring tide
• Waning Gibbous, neap tide
• First Quarter, neap tide
• New Moon, spring tide

Why is magma mostly liquid? MS-ESS2-2 MS-ESS2-1 MS-PS3-4

• Mountains keep the magma liquefied.
• Nothing. Magma is mostly solid.
• Magma has special chemicals mixed in to keep it liquid.
• Earth's core is under enormous pressure so it remains very hot. That heat conducts out to the mantle, keeping the rock melted.

Compare the statements below, and select which is correct: MS-ESS2-1

• Evidence shows that Earth was created when it was ejected from the sun.
• Evidence shows that humans have been on Earth for 4.54 billion years.
• Evidence shows that all rocks can turn into other types of rocks.
• Evidence shows that Earth's atmosphere is a major factor in subduction zones.

Fission involves ____________________________. MS-PS1-1 MS-PS3-2

• converging plate boundaries
• the burning of oxygen atoms
• the bonding of two atoms
• the division of an atomic nucleus

On the picture below, the letter "A" represents which frequency of electromagnetic radiation? MS-PS4-1 MS-PS4-2

• violet waves
• white waves
• reflection
• radio waves

All nuclear reactions will ________________.MS-PS1-1 MS-PS3-2

• change the number of protons in the atoms involved
• break the molecular bonds
• turn liquids into solids
• freeze the atoms

As you see in a lava lamp, matter can rise and sink due to changes in temperature and density. What is this process called? MS-PS3-4

• static electricity
• sublimation
• chemical bonding
• convection

In the picture below, Earth is shown in four different positions around the sun. In position D, which season begins in the Northern Hemisphere? MS-ESS1-1

• Winter
• Spring
• Summer
• Fall/Autumn

What is the main reason the Earth has seasons? MS-ESS1-1

• The speed of Earth's revolution around the sun.
• The 23.5° tilt of the Earth.
• The climate in a given area.
• The gravitational pull of the moon.