Table of Contents
- 1 What type of volcano does Pahoehoe lava come from?
- 2 What is aa and Pahoehoe lava?
- 3 What is the primary difference between aa and Pahoehoe lava flows?
- 4 Which flows faster aa or pahoehoe?
- 5 What type of lava is aa lava?
- 6 What does the composition of magma determine?
- 7 What is the definition of pahoehoe in geography?
- 8 What is the difference between lava and magma?
What type of volcano does Pahoehoe lava come from?
Photos and brief explanation. Ropy pahoehoe lava (Hawaii). Brief explanation: Pahoehoe lava is a common type of basaltic lava that cools down forming typical smooth, billowy, or ropy surfaces.
What is aa and Pahoehoe lava?
Pahoehoe is lava that in solidified form is characterized by a smooth, billowy, or ropy surface, while aa is lava that has a rough, jagged, spiny, and generally clinkery surface. In thick aa flows, the rubbly surface of loose clinkers and blocks hides a massive, relatively dense interior.
How does the type of lava determine the type of volcano?
When magma erupts at the surface as lava, it can form different types of volcano depending on: the viscosity, or stickiness, of the magma. the amount of gas in the magma. the composition of the magma.
What is the primary difference between aa and Pahoehoe lava flows?
What is the difference between Pahoehoe and Aa lava? Pahoehoe lava is smoother and flows faster than Aa lava. Aa is much slower and hardens into a jagged surface while pahoehoe lava hardens into a smooth surface.
Which flows faster aa or pahoehoe?
A’a lava is much more ragged in appearance. It’s more viscous and moves faster, and it carries broken lava blocks called clinkers that cover the actual lava flow. Pahoehoe lava can sometimes turn into a’a lava when it encounters a steep slope. Once it does, it can never revert back.
Why are aa lava flows fragmented and rough while pahoehoe flows are smooth?
Aa flows are generally 6-15 feet thick and pahoehoe flows are usually 1-3 feet thick. If the lava is very hot and has a low viscosity (runny with a low gas and silica content) the lava flow is called Pahoehoe. When it cools is has a smooth to ropey texture because of the low silica content which makes it cool quickly.
What type of lava is aa lava?
Mafic (ferromagnesian, dark-coloured) lavas such as basalt characteristically form flows known by the Hawaiian names pahoehoe and aa (or a’a). Pahoehoe lava flows are characterized by smooth, gently undulating, or broadly hummocky surfaces.
What does the composition of magma determine?
The composition of magma determines its viscosity, which affects how a lava flows and what kind of volcano forms from the lava.
What determines whether volcanic activity will be a lava flow or a pyroclastic eruption?
Volcanic eruptions can be explosive, sending ash, gas and lava high up into the atmosphere, or the magma can form lava flows, known as effusive eruptions. Whether an eruption is explosive or effusive largely depends upon the amount of gas in the magma.
What is the definition of pahoehoe in geography?
[pah-hoh-ey-hoh-ey] (Listen here) Definition. A form of lava flow of basaltic rock, usually dark-coloured with a smooth or rippled surface.
What is the difference between lava and magma?
Scientists use the term magma for molten rock that is underground and lava for molten rock that breaks through the Earth’s surface.
What is pahoehoe lava flows?
“Pahoehoe” is a Hawaiian word used to describe a lava flow with a smooth, ropy surface. Pahoehoe flows advance slowly, with small amounts of lava squeezing out of a cooler crust.