Rocks, Soil and Minerals_3

How are sedimentary rocks formed?

• Chemical precipitation and crystallization
• Volcanic activity, cooling, and solidification
• Weathering, erosion, deposition, compaction, and cementation
• Metamorphism and recrystallization

How long does it typically take for sedimentary rocks to form?

• decades
• millions of years
• thousands of years
• hundreds of years

What percentage of the Earth's land surface is covered by sedimentary rocks?

• A) 10 percent
• B) 40 percent
• D) 60 percent
• C) 75 percent

What proportion of the Earth's crust, by volume, is made up of sedimentary rocks?

• 10 percent
• 7 percent

• 3 percent

• 6 percent

• 5 percent

Which sedimentary rock consists of rounded pebbles and cobbles cemented together?

• Limestone
• Sandstone
• Shale
• Conglomerate

What type of rock consists of coarse gravel, stones, and pebbles that solidify into an uneven-looking rock?

• sandstone
• limestone
• shale
• granite
• conglomerate

Which process leads to the formation of conglomerate rocks?

• metamorphism
• erosion
• volcanic activity
• sedimentation

Which process leads to the formation of conglomerate rocks?

• A) Heat and pressure

• B) Crystallization from magma

• C) Compaction of clay minerals

• D) Accumulation of rounded gravel and pebbles

Conglomerate rocks are often associated with what type of environment where the gravel and pebbles accumulate?

• A) Marine environments

• B) Desert landscapes

• C) Volcanic regions

• D) Riverbeds and alluvial plains

What is the characteristic texture of conglomerate rocks?

• A) Fine-grained and smooth

• B) Uniformly layered

• C) Coarse, with rounded fragments

• D) High gloss and reflective