Busy. Please wait.
Log in with Clever

show password
Forgot Password?

Don't have an account?  Sign up 
Sign up using Clever

Username is available taken
show password

Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Didn't know it?
click below
Knew it?
click below
Don't Know
Remaining cards (0)
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

LMS Ch 13.2 DR

Volcanic Eruptions Directed Reading

Lava provides an opportunity for scientists to study?? The nature of Earth’s crust and mantle.
By analyzing the composition of volcanic rocks, geologists have concluded that there?? Are two general types of magma.
Magma or igneous rock that is rich in feldspar and silica and is generally light in color is called?? Felsic.
agma or igneous rock that is rich in magnesium and iron and is generally dark in color is called?? Mafic.
Mafic rock commonly makes up?? Oceanic Crust.
Felsic rock commonly makes up?? Continental Crust.
The force of a volcanic eruption is affected by?? The viscosity of magma.
Mafic magmas, with low viscosity and runny lava, cause?? Quiet eruptions.
Felsic magmas, with high viscosity and sticky lava, cause?? Explosive eruptions.
Explosive eruptions are most likely to be caused by magma with?? Large amounts of trapped, dissolved gases.
Oceanic volcanoes commonly form from?? Mafic magma.
Eruptions from oceanic volcanoes are usually?? Quiet eruptions.
When mafic lava cools rapidly it?? Forms a crust.
One of the most important warning signals of volcanic eruptions is?? A change in earthquake activity around the volcano.
Pyroclastic particles less than 2 mm in diameter that mostly fall on the land that immediately surrounds the volcano are called?? Volcanic Ash.
Pyroclastic particles less than 0.25 mm in diameter that are so small they might travel around Earth in the upper atmosphere are called?? Volcanic Dust.
Large pyroclastic particles less than 64 mm in diameter that generally fall near the vent are called , a name taken from a Latin word meaning “little stones.”?? Lapilli.
Large clots of lava thrown out of an erupting volcano while red-hot, that spin through the air, cool, and develop a round or spindle shape are called?? Volcanic Bombs.
The largest pyroclastic particles, which form from solid rock blasted from the volcano’s vent, are called?? Volcanic Blocks.
Pahoehoe?? Forms a smooth, ropy texture as it cools.
Aa Lava?? Forms jagged, sharp chunks when it cools.
Blocky Lava?? Breaks into large chunks at the surface while hot lava continues to flow underneath.
Volcanic Cone?? Structure formed by lava and pyroclastic material ejected during volcanic eruptions.
Crater?? The funnel-shaped pit at the top of a volcanic vent.
Shield Volcano?? A volcanic cone that is broad at the base and has gently sloping sides.
Cinder Cone?? Volcano with very steep slopes that are rarely more than a few hundred meters high and have angles close to 40°.
Composite Volcano?? Volcano made of alternating layers of hardened lava flows and pyroclastic material.
Created by: ericyonggyuhong
Popular Earth Science sets




Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
restart all cards