Leap Science

Which statement BEST describes the distribution of water on Earth?

• Most of Earth's water is stored in the oceans.

• Most of Earth's water is frozen in the polar ice caps.

• Most of Earth's water is flowing in streams and rivers.

• Most of Earth's water is trapped in underground aquifers.

Tags

NGSS.MS-ESS2-4

A student reads the following information about smooth cordgrass in a science magazine.

*It is one of the few plants that grow in the tidal zone of saltwater marshes.

*It can grow to heights ranging from 6 inches to 7 feet tall.

Figure 1 shows a cross section that compares cordgrass heights in the tidal zone of a saltwater marsh. The tidal zone moves water around. This removes some of the dangerous substances that can keep plants from growing.

A student wants to know the ideal conditions for smooth cordgrass growth. Based on the information in Figure 1, which question is best for the student to investigate?

• Does cordgrass need a certain type of soil to grow taller?

• Does cordgrass need to have its seeds spread by a certain animal?

• Does cordgrass need to have a certain depth of water to grow leaves?

• Does cordgrass need a certain amount of salt in the water it grows in?

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

What causes the glow stick to produce light?

• A new material is formed when the glass mixes with Chemical W.

• A new material is formed when the glow stick's temperature changes.

• A new material is formed when Chemical X and Chemical W are shaken.

• A new material is formed when Chemical X is mixed with Chemical W.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which evidence BEST supports the answer to question 12?

• The glow stick is brighter in cold temperatures.

• The glass capsule is broken and cannot be fixed.

• The glow stick produces light right after the two chemicals are mixed.

• The two chemicals are separated inside a solid container.

Tags

NGSS.MS-PS1-2

In an ecosystem, what role do producers play in the food chain?

• They consume other organisms.

• They produce energy for consumers.

• They convert sunlight into usable energy.

• They break down dead organisms.

Tags

DOK Level 2: Skill/Concept

How does Earth's rotation affect the day and night cycle?

• It causes the seasons to change.

• It changes the moon's phases.

• It leads to day when the area faces the sun and night when it faces away.

• It affects the gravitational pull of the moon.

Tags

DOK Level 2: Skill/Concept

Dry ice goes from a solid directly to a gas when it gets warmer.

Students placed a small piece of dry ice inside a balloon, added air to the balloon, and sealed it. The figure shows the balloon and the dry ice at the beginning and end of the experiment.

Which statement BEST describes the balloon and the dry ice at the end of the experiment?

• The total mass decreased and the total volume increased.

• The total mass increased, and the total volume decreased.

• The total mass remained the same, and the total volume increased.

• The total mass decreased, and the total volume remained the same.

Tags

NGSS.MS-PS1-2

Which statement BEST explains the answer to Question 18?

• The dry ice inside the balloon got smaller over time.

• The balloon expanded as it took in air from the room.

• The balloon and the dry ice got warmer as they changed size.

• The dry ice became a gas that was trapped inside the balloon.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

A student observes what happens when he releases a wadded-up piece of paper, a baseball, and a rock from one meter above the ground all at the same time. All three objects move in the same direction. Which claim can be made based on the student's observation?

• The volume of the objects causes the objects to fall down toward Earth.

• The rotation of Earth causes the objects to fall down toward Earth.

• The density of the objects causes the objects to fall down toward Earth.

• The gravitational force of Earth causes the objects to fall down toward Earth.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

A herring gull dies in the saltwater marsh.

Put the following steps in the correct order to model how the matter from the dead herring gull is moved in a saltwater marsh.

The blue crab eats the sheepshead minnow.

The grass shrimp eats the decaying matter.

The sheepshead minnow eats the grass shrimp.

Matter in the herring gull decays.

• A, B, C, D

• D, C, B, A

• D, B, C, A

• B, C, A, D

Tags

NGSS.MS-LS2-3