Izzy notices that many of the rocks in the bottom of a river are smooth. How long did it take for the water to make the texture of the rocks smooth?

Students are asked to describe how changes happen on Earth. Which student gave the best answer?

Kyle visited a canyon on vacation. He learned that a river made this very deep canyon. How long did it take for the canyon to form?

Raul is looking at a big mountain. How long does it take a mountain to form?

Students are filling in a chart about changes to land. Students think of another change: lava flowing from a volcano. Where is the best place for them to write this change?

Which of these will make the fastest change?

Jazmine is building a sand castle at the beach. She builds the sand castle next to the ocean water. How long will the sand castle stay up until the ocean waves cause it to fall down?

Ramon and his father are driving. His father stops the car because there is a big hole in the middle of the road that wasn’t there yesterday. Ramon’s father explains that it is a sinkhole. How does Ramon know that sinkholes can form quickly?

Which of these would most likely take the longest period of time to change the land?