Students in Mr. Stoval's class were studying weathering and erosion. One group of students placed some limestone chips in a beaker. Next they poured in 50 ml of water to which they added 5 ml dilute HCl. After 48 hours, the limestone chips had almost disappeared and the water was cloudy. This simple experiment is an example of what process on Earth?(1 point)
Responses
A. Acid rain falls over limestone rock and washes particles away. This is the result of the kinetic energy of the moving water and it is a physical process.
B. Water physically erodes limestone and it is carried away by moving groundwater.
C. Acidic groundwater or precipitation chemically reacts with limestone resulting in Karst features.
D. Acid rain falls on limestone rock and physically dissolves the particles in the rock. This is similar to dissolving salt in water. It occurs in places where evaporite form.
C. Acidic groundwater or precipitation chemically reacts with limestone resulting in Karst features.
Which is an example of physical weathering?(1 point)
Responses
A. oxidation of certain metals in rock
B. bits of rock rusting when exposed to oxygen and water
C. limestone in rock dissolving when acid rain flows across it
D. wind blowing off bits of a rock over time
D. wind blowing off bits of a rock over time
A group of earth science students were investigating in the laboratory. They took granite rock and limestone samples and massed them on a balance. Then, students placed the rock samples in closed plastic vials. The students shook them vigorously for thirty minutes. Students then massed the rocks again. What question might the students be testing?(1 point)
Responses
A. How does granite change shape after mechanical breakdown?
B. Why does granite rock break down more quickly?
C. Which rock type changes more due to physical weathering?
D. How do rocks interact during mechanical manipulation?
C. Which rock type changes more due to physical weathering?
In Utah’s Arches National Park we can see many interesting shapes like this one below. Many different things helped to shape this arch: earthquakes, rivers, freezing water, and wind. Which one of these made the surface of the arch smooth and rounded?
A. water freezing in the cracks
B. earthquakes
C. a river running through the rocks
D. strong winds