Materials and their Properties
What I should already know:
What I should already know:
- Objects are made from materials.
- A variety of everyday materials: wood, glass, plastic, metal and fabric.
- Some materials are natural(wood) some are man-made (plastic).
- Describe properties of materials: soft, hard, shiny, rough etc.
- Identify similarities and differences of materials and their properties: stretchy, stiff, transparent, opaque, absorbent etc.
- Solids have a shape that is not easy to change. To change them we must bend, squash, twist or stretch them.
Grouping Materials
Grouping Materials
Solids
Solids
- Stay in one place and can be held.
- Most solids keep their shape. They do not flow like liquids.(Some solids like sand or salt can be poured).
- Always take up the same amount of space. Do not spread out like gases.
Liquids
Liquids
- Liquids can flow or be poured.
- They are not easy to hold.
- Change their shape depending on the container they are in.
Gases
Gases
- Gases are often invisible.
- Gases do not keep their shape. They spread out and change their shape and volume to fill up whatever container they are in.
The Water Cycle
The Water Cycle
Water on Earth is constantly moving, changing state (from liquid, to gas, to solid) and being recycled. The water cycle describes this journey. There are 4 main stages in the water cycle: evaporation, condensation, precipitation and collection.
Water on Earth is constantly moving, changing state (from liquid, to gas, to solid) and being recycled. The water cycle describes this journey. There are 4 main stages in the water cycle: evaporation, condensation, precipitation and collection.
Evaporation:
Evaporation:
When the sun heats the surface of seas, lakes, rivers and streams, some of the water changes state and becomes water vapour, mixing with the air. Warm air rises so the water vapour rises too.
When the sun heats the surface of seas, lakes, rivers and streams, some of the water changes state and becomes water vapour, mixing with the air. Warm air rises so the water vapour rises too.
Condensation:
Condensation:
When the air cools down, the water vapour condenses back into water droplets. These water droplets collect together and form clouds.
When the air cools down, the water vapour condenses back into water droplets. These water droplets collect together and form clouds.
Precipitation:
Precipitation:
The water droplets in clouds attract other water droplets to them and they grow bigger. When they get too big and heavy they fall to ground as rain. If the air is cold enough the droplets remain frozen and fall as snow or hail.
The water droplets in clouds attract other water droplets to them and they grow bigger. When they get too big and heavy they fall to ground as rain. If the air is cold enough the droplets remain frozen and fall as snow or hail.
Collection:
Collection:
When the water falls to Earth it collects as streams, rivers or lakes. When it falls on land in can filter in to the Earth and become groundwater or it can flow over the land as run off to meet existing bodies of water.
When the water falls to Earth it collects as streams, rivers or lakes. When it falls on land in can filter in to the Earth and become groundwater or it can flow over the land as run off to meet existing bodies of water.
Think you know it all? Take the quiz!
Think you know it all? Take the quiz!