A system is an ​ (a)   structure made of different ​ (b)   . These elements are ​ (c)   , that is connected, and ​ (d)   . They continually influence one another, and if one element is ​ (e)   , the consequences affect also the other elements and the activity of the whole system.

• organized
• elements
• interrelated
• interdependent
• damaged
• spheres

Tags

NGSS.MS-ESS3-4

NGSS.MS-LS2-3

NGSS.MS-LS2-4

Match the following

• lithosphere

• The Earth's crust including rocks and soils.

• atmosphere

• The thin layer of air (gases) that surrounds the Earth.

• biosphere

• The water on thre surface of the Earth in oceans, rivers, lakes, rain, and solid water in glaciers.

• pedosphere

• The layer where the other spheres interact.

• hydrosphere

• All living things on Earth.

Tags

NGSS.MS-ESS2-1

NGSS.MS-ESS2-4

NGSS.MS-ESS2-5

The soil is

• a mixture of sand, silt and clay

• a mixture of weathered rock, organic matter, air and water

• a mixture of rocks and water

• a mixture of sand, silt, clay and loam

Weathered rock is

• sand, silt, clay

• sand, silt, clay, pebbles and larger rocks

• solid rock

• loam and water

Tags

NGSS.MS-ESS2-1

NGSS.MS-ESS2-2

Organic matter in soil can be

• old leaves, decaying plants and animals, and roots

• only small living things

• microorganisms (like bacteria) and tiny living things

• silt and clay

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

Why is soil important?

• it provides nutrients, water, and mineral salts for plants

• it provides a place where organisms can live

• it is not important

• we could not meet our basic needs without soil

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

Look at the diagram about soil composition. What does 45% correspond to?

a

water

organic matter

mineral particles

air

Look at the diagram about soil composition. What does 25% correspond to?

b

organic matter

water and moisture

sand, silt and clay

mineral particles

Look at the diagram about soil composition. What does 25% correspond to?

b

mineral particles

sand, silt and clay

air

organic matter

Look at the diagram about soil composition. What does 5% correspond to?

d

organic matter

air

sand, silt and clay

mineral particles