Magma And Lava

Question 1

Basaltic lava

Answer 1

• from volcanoes
• contains relatively low amounts of silicate minerals
• this allows it to flow quickly and smoothly over long distances

Question 2

Mafic lava

Answer 2

• fast cooling (ex basalt)
• hotter, thinner, more fluid
• large amounts of Fe, Mg
• darker in colour

Question 3

Felsic lava

Answer 3

• slow cooling (granite)
• thick
• contains a lot of SiO2
• lighter in colour

Question 4

‘A’a lava

Answer 4

• rapidly flowing
• surface cools quickly, breaking up
• smaller crystals

Question 5

Pahoehoe lava

Answer 5

• slow flowing
• cools more slowly
• larger crystals