Vocabulary
What does expand mean?
to increase in size or amount
What is an organism?
a living thing
What do roots do?
anchor plants in place and absorb water and nutrients from the soil
_____ anchor a plant in place.
Roots
___ can break a rock.
Ice
What does absorb mean?
the process by which one substance soaks into or is taken in by another substance
What does decompose mean?
to decay
When rocks are rubbed together, they become ______ and _______.
smaller smoother
Roots hold on to soil _________.
particles
Growing plants can break a ____.
rock
What does thaw mean?
to go from being a frozen solid to being a soft solid or a liquid
What are fungus?
one of a large group of living things that appear like plants but cannot make their own food using sunlight in the way plants do. Fungi consume plant, animal, and other living matter.
_______ fall off larger rocks.
Particles
Roots absorb _____.
water
_______ break down rocks with acids.
Lichens
What are particles?
a very small piece or part; a tiny portion or speck
What is algae?
organisms or living things
Particles that fall off larger rocks make up the ____.
soil
_____ are always growing.
Roots
What components make up soil?
sand, silt, clay, humus, water, air
What is lichen?
an organism made of a fungus and algae that live together
What is acid?
chemicals that can break apart many materials
____, ____ and ____ come from rocks.
Sand, silt and clay
When water freezes, it _______.
expands
Is lichen safe to touch with your bare hands?
No!