Quiz on ice's impact on rocks and sidewalks (Grade 2)

🧊 Quick Study Guide

• 💧 Water Expands When Frozen: When water freezes into ice, it takes up more space.
• 🪨 Ice Cracks Rocks: If water gets into cracks in rocks and freezes, the ice can push the rock apart and make the cracks bigger. This is called ice wedging.
• 🚶‍♀️ Ice Breaks Sidewalks: The same thing happens to sidewalks! Water seeps into tiny cracks, and when it freezes, it pushes the concrete apart, causing cracks and breaks.
• 🌡️ Freeze-Thaw Cycle: The repeated freezing and thawing (melting) of ice makes the cracks even bigger over time.
• 🧂 Salt Melts Ice: Salt helps to melt ice by lowering the freezing point of water. That's why we use salt on sidewalks!

🧪 Practice Quiz

1. Which of these happens when water freezes?
   1. It takes up more space.
   2. It takes up less space.
   3. It stays the same size.
2. What is it called when ice breaks rocks apart?
   1. Ice melting
   2. Ice wedging
   3. Rock freezing
3. What does the freeze-thaw cycle do to cracks?
   1. Makes them disappear.
   2. Makes them smaller.
   3. Makes them bigger.
4. Why do sidewalks crack in the winter?
   1. Because of the sun.
   2. Because ice pushes the concrete apart.
   3. Because people walk on them.
5. What helps melt ice on sidewalks?
   1. Sugar
   2. Salt
   3. Pepper
6. Where does water get into to cause damage?
   1. Big holes
   2. Tiny cracks
   3. Empty spaces
7. What happens when ice melts (thaws)?
   1. It turns into snow.
   2. It turns into water.
   3. It turns into rock.