Question

1. rocks can be classified as sedimentary, igneous, or metamorphic based primarily upon differences in their

a) density b) origin c) age d) color

1. which sequence of change in rock type occurs as shale is subjected to increasing heat and pressure?

a) shale, schist, phyllite, slate, gneiss c) shale, slate, phyllite, schist, gneiss
b) shale, gneiss, phyllite, slate, schist d) shale, gneiss, phyllite, schist, slate

Explanation:

For question 6: Rocks are classified as sedimentary, igneous, or metamorphic mainly based on their origin. Sedimentary rocks form from sediments, igneous from magma/lava, and metamorphic from pre - existing rocks under heat and pressure.
For question 7: As shale (a sedimentary rock) is subjected to increasing heat and pressure, it undergoes metamorphism. The sequence is shale (original) → slate (low - grade metamorphism) → phyllite (higher than slate) → schist (higher than phyllite) → gneiss (high - grade metamorphism).

Answer:

1. B. origin
2. C. shale, slate, phyllite, schist, gneiss