GoalReview natural and made things, solid, liquid and gas, warming and cooling, and monument design.
New words
solid · keeps its own shapeliquid · flows and takes the shape of its containergas · spreads out and fills the space it is inmonument · a building or statue that helps us remember
Explanation
Some things are made by nature and some are made by people. Materials such as wood, metal, glass and cloth come in three forms: solid, liquid and gas. Water can be ice, water or steam. Warming melts ice, and cooling freezes water. A cooked egg cannot be made raw again. Wind and water slowly carry away soil and rock, and this is called erosion. A monument helps us remember a person, a place or an event. A design must follow its requirements. A ticket shows the name of the place, a picture, a date and a price.
Worked examples
Seif leaves an ice cube in the sun, and it melts. He puts the water in the freezer, and it freezes again.
Habiba checks her monument model against the list. It has two materials, a pattern, and it is 14 centimetres tall. All the requirements are done.
Strong wind blows sand against an old stone wall for many years. The wall slowly wears away. This is erosion.
Class activity
Materials walk with a grown-up. Find three solids, and with help find one liquid and show that air is a gas. Sort five things into made by nature and made by people. Then draw a small monument for your street. Write on it: the name, two materials, one pattern. Show it to your family.
Practice
1
Is juice a solid, a liquid or a gas?
A liquid.
2
What happens to ice in the sun?
It melts into water.
3
Strong wind blows sand against a stone wall for many years, and the wall slowly wears away. What is this called?
