This photograph shows chert.How does it form?
A)evaporation of water in a lake or sea
B)accumulation of microscopic organisms composed of calcium carbonate
C)precipitation from seawater early in Earth's history
D)accumulation of silica-rich organisms or mixing of seawater and groundwater

Question

This photograph shows chert.How does it form? 
A)evaporation of water in a lake or sea 
B)accumulation of microscopic organisms composed of calcium carbonate 
C)precipitation from seawater early in Earth's history 
D)accumulation of silica-rich organisms or mixing of seawater and groundwater

Quizplus · Accepted Answer

Chert forms through the accumulation of silica-rich organisms or mixing of seawater and groundwater, which leads to the precipitation of silica.

This Photograph Shows Chert.How Does It Form