Soil/Weathering

what is humus?

• Humus is a mineral found in rocks.
• Humus is a type of fertilizer.
• Humus is decomposed organic matter in soil.
• Humus is a synthetic chemical used in agriculture.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

NGSS.MS-LS2-4

Soil forms quickly, usually within a few days

• True
• False

what process breaks rocks into smaller pieces over time?

• melting

• deposition

• erosion

• weathering

what is soil made of?

• sand, clay, silt, organic matter, water, and air

• dirt and worms

• only rocks

• only water and air.

abrasion

• decomposed organic material

• sand,silt, clay, gravel, pebbles

• where rocks and surfaces rub against each other, wearing them down over time, often by wind, water, or ice

• the type of earth material you can’t see with the human eye

Tags

NGSS.MS-ESS2-2

physical weathering

• when the composition of the soil doesn’t change, just the size and shape.

• when chemicals like acid or rust break down an object

• decomposed organic material

Tags

NGSS.MS-ESS2-2

where are pebbles usually found?

• desert

• river delta

• forest

• mountains

where is sand usually found most?

• desert

• river delta

• forest

• mountains

when we used a bottle to show the effects rocks can have due to weathering this was a _________

Tags

NGSS.MS-ESS2-2

NGSS.MS-ESS2-1

how does water cause weathering?

• by freezing (expanding) and thawing in the cracks

• dissolves certain minerals in rocks

Tags

NGSS.MS-ESS2-4