8th Science STAAR Review

Rift valleys can form when fractures in Earth’s crust widen. The valley walls slowly move at a rate of only a few millimeters a year. Which of these best describes the type of tectonic activity that forms rift valleys?

• Rift valleys form where a continental plate moves under an oceanic plate.

• Rift valleys form where two plates move away from each other.

• Rift valleys form where a plate slides horizontally past another plate.

• Rift valleys form where an oceanic plate moves under another oceanic plate.

Tags

NGSS.MS-ESS2-2

Which statement correctly describes the location and charge of the electrons in an atom?

• The electrons are inside the nucleus and have no charge.

• The electrons are outside the nucleus and have no charge.

• The electrons are inside the nucleus and have a negative charge.

• The electrons are outside the nucleus and have a negative charge.

Two friends want to go for a night hike when there is a full moon in July. If there is a third-quarter moon on July 2, what is the approximate date of the next full moon?

• July 9

• July 23

• July 16

• July 30

Tags

NGSS.MS-ESS1-1

Both primary and secondary succession begin with pioneer species that —

• modify the area and allow larger and more complex organisms to appear

• change the area and make it safer from predatory organisms

• invade the area so that new organisms cannot be established

• use up all the existing resources and prevent establishment of non-native organisms

Which of these changes would likely occur if the rate of Earth’s rotation on its axis increased?

• The length of the seasons would be shorter.

• The length of a day would be shorter.

• The length of the seasons would be longer.

• The length of a day would be longer.

The universe has many different components. Which list places four components of the universe in the most likely order from smallest to largest?

• Planets, stars, galaxies, nebulae

• Nebulae, stars, planets, galaxies

• Galaxies, stars, planets, nebulae

• Planets, stars, nebulae, galaxies

Tin, Sn, is a soft white metal. It has a low melting point compared with other metals. Tin is widely used as a coating for cans of food. Which statement accurately describes atoms of tin?

• Tin atoms have 50 protons.

• Tin atoms have 68 electrons.

• Tin atoms have 119 neutrons.

• Tin atoms have five valence electrons.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following is the name of the ancient supercontinent formed 28 Million Years ago.

• Pangea
• Gondwanda
• Laurasia
• Neverland

Tags

NGSS.MS-ESS1-4

Islands can from from magma which is pushed up at a __________ plate boundary

• Divergent
• Convergent
• Transform

Tags

NGSS.MS-ESS2-3

The Himalayas in Asia are an example of what type of plate boundary?

• divergent
• continent-to-continent convergent
• ocean-to-continent convergent
• transform

Tags

NGSS.MS-ESS2-3