Question

how are granite and gneiss different?
granite crumbles easily while gneiss is very hard.
gneiss has a layered texture instead of being solid like granite.
gneiss comes in many colors while granite only comes in one color.
granite has a layered texture instead of being solid like gneiss.

1. choose the correct answer.

hornblende is the parent rock of ____.
sandstone
slate
gneiss
granite

1. choose the correct answer.

shale is the parent rock of __, , and __.
marble; gneiss; limestone
quartz; slate; gneiss
slate; schist; phyllite

Explanation:

Question 1 (How are granite and gneiss different?):

• Granite is an intrusive igneous rock with a non - layered (massive) texture. Gneiss is a metamorphic rock that forms from the metamorphism of granite (or other rocks) and has a foliated (layered) texture.
• The first option is wrong as both granite and gneiss are hard. The third option is wrong as both can have multiple colors. The fourth option is wrong as it reverses the textures of granite and gneiss.

• Sandstone is a sedimentary rock, so hornblende (a mineral in metamorphic/igneous contexts) can't be its parent. Slate is formed from shale (sedimentary). Granite is an igneous rock. Gneiss can be formed from the metamorphism of rocks containing hornblende - bearing parent rocks (like amphibolites which have hornblende).

• Shale is a sedimentary rock. Through metamorphism, it first forms slate, then phyllite, and then schist. Marble is from limestone, gneiss is from granite - like rocks, and quartz is a mineral (not formed from shale in this sequence).

Answer:

B. Gneiss has a layered texture instead of being solid like granite.

Question 2 (Hornblende is the parent rock of ______):