Ages 7–8🔬 Science10 verified questions on this shelf
Properties of materials
Compare and group different kinds of rocks based on their appearance and simple physical properties such as hardness, texture, and colour
Try three questions
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Question 1 of 3
A student examines two rocks. Rock A is smooth, light gray, and feels soft. Rock B is rough, dark brown, and feels hard. Which statement correctly compares these two rocks based on observable properties?
Question 2 of 3
A scientist examines four rocks and records their properties:
- Rock A: dark gray, smooth texture, hard when scratched.
- Rock B: light brown, rough texture, easy to scratch.
- Rock C: dark gray, smooth texture, hard when scratched.
- Rock D: dark gray, rough texture, hard when scratched.
Which two rocks should be grouped together because they have the same colour and the same texture?
Question 3 of 3
You have five rocks with these observations: - Rock M: dark green, smooth, you cannot scratch it with your fingernail. - Rock N: light yellow, rough, your fingernail makes a mark when you try to scratch it. - Rock O: dark green, rough, you cannot scratch it with your fingernail. - Rock P: light yellow, smooth, your fingernail makes a mark when you try to scratch it. - Rock Q: dark green, smooth, your fingernail makes a mark when you try to scratch it. You want to sort the rocks into two groups so that all rocks in the same group have the same hardness (hard to scratch or soft to scratch) and rocks in different groups have different hardness. Which grouping is correct?
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