Question

1. the cross - sections below show widely separated outcrops at locations x, y, and z.

which rock layer was formed by the compaction and cementation of particles that were all less than 0.0004 centimeter in diameter?
a) brown siltstone
b) red sandstone
c) conglomerate
d) green shale

1. the profile below shows the average diameter of

Explanation:

Step1: Recall sediment - rock formation knowledge

Sedimentary rocks are formed by compaction and cementation of particles. Shale is formed from very fine - grained particles (less than 0.004 cm in diameter).

Step2: Analyze each option

• Brown siltstone: Siltstone is formed from particles larger than those of shale (0.004 - 0.0625 cm).
• Red sandstone: Sandstone is formed from sand - sized particles (0.0625 - 2 cm).
• Conglomerate: Conglomerate is formed from rounded gravel - sized particles (larger than 2 cm).
• Green shale: Shale is formed from clay - sized particles which are less than 0.004 cm in diameter.

Answer:

D. green shale