Earth History: Investigations 1 and 2

The Wentworth scale classifies rock particles by: 

• texture
•  size
• color
• minerals

True or False. Larger particles are carried farther and more easily than smaller particles. 

• TRUE
• FALSE

The type of rock that bubbles when you put acid on it is:

• Limestone
• Sandstone 
• Shale

The substance in rock that reacts with acid to produce fizzing is called: 

• potassium
• calcite
• oxygen
• water

Which one of these rock particles is the SMALLEST? 

• boulder
• pebble
• cobble
• sand

Which of these is NOT an example of CHEMICAL WEATHERING? 

• lichens producing carbonic acid that breaks down rocks 
• acid rain wearing away at rocks 
• frost wedging enlarging the cracks between rocks 
• plant roots producing carbon dioxide, which combines with moisture to produce a weak acid 

Which one of these is NOT an example of PHYSICAL WEATHERING?

• lichens wearing away rock with the weak acid they produce 
• rocks bumping into each other and breaking
• wind carrying sediments from one place to another 
• waves crashing against and particles at the beach 

Which one of these rock particles is the LARGEST?

• gravel
• boulder
• clay
• silt

Which rock particle would travel the FARTHEST along a stream? 

• boulder
• sand
• clay
• gravel

Which rock particle would travel the LEAST along a stream? 

• pebble
• cobble
• sand
• silt