Study Questions: Igneous Textures

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Chapter 3

STUDY QUESTIONS: Read through the book and answer the following questions.

This activity contains 10 questions.

____ size, shape, and orientation of mineral grains

pegmatitesaphanitic texturevolcanicrock texturepumiceobsidianextrusive rocksphaneritic textureporphyritic textureplutonic rocks

____ texture characterized by visible crystals

porphyritic texturephaneritic texture obsidianpumicerock texturevolcanicaphanitic textureextrusive rockspegmatitesplutonic rocks

____ igneous rocks with a phaneritic texture

volcanicporphyritic texturephaneritic texture extrusive rockspegmatitesplutonic rocksrock texturepumiceaphanitic textureobsidian

____ watery, ion-rich magmas that generate large crystals

aphanitic textureplutonic rocksphaneritic texturepumicevolcanicextrusive rocksrock textureporphyritic textureobsidianpegmatites

____ texture characterized by barely visible crystals

plutonic rockspumiceaphanitic texturephaneritic texture extrusive rocksvolcanicrock textureobsidianporphyritic texturepegmatites

____ source of lava flowing on the surface

phaneritic textureobsidianaphanitic texturepegmatitesextrusive rocksvolcanicpumicerock textureplutonic rocksporphyritic texture

____ rocks formed from lava on the Earth’s surface

porphyritic texturepumiceaphanitic textureplutonic rocksvolcanicextrusive rocksobsidianphaneritic texturerock texturepegmatites

____ texture with variable-sized crystals

volcanicpegmatitesaphanitic textureobsidianplutonic rocksrock textureporphyritic texturephaneritic textureextrusive rockspumice

____ a smooth volcanic glass that will break by fracture

porphyritic texturepumiceaphanitic textureplutonic rocksvolcanicextrusive rocksobsidianphaneritic texturerock texturepegmatites

____ a cellular volcanic glass light enough to float

porphyritic texturepegmatitesvolcanicrock textureobsidianaphanitic texturephaneritic texturepumiceplutonic rocksextrusive rocks

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