Geology and Grain Size Quiz

What is the primary focus of the Wentworth scale introduced in 1922?

• Determining the chemical composition of rocks

• Classifying sedimentary rocks by color

• Classifying sediments by grain size

• Measuring the weight of sediment particles

Which tool is necessary to study clay grains due to their small size?

• Magnifying glass

• Telescope

• Binoculars

• Microscope

How many different grain sizes are there for sand in the Wentworth scale?

• Six

• Four

• Three

• Five

What significant change did W.C. Crumbian introduce to the Wentworth scale?

• He added more categories for larger grains

• He removed the category for clay

• He focused on the color of sediments

• He used a logarithmic scale for measurement

What is the purpose of grain size comparator charts?

• To determine the age of sedimentary rocks

• To measure the temperature of sediments

• To visualize the Wentworth scale pictorially

• To compare the weight of different rocks