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7th Grade Science – Test Review 2.3
Vocabulary Review
Word Bank – some words may be used more than one time
Limiting factors
Two rocks
Biological diversity
Carbonic Acid
Sink Holes
1. Earth's Biomes, including freshwater, marine, desert, forest, grassland, and tundra and their
main vegetation type, support organisms that are adapted to that particular environment.
2. Like a habitat, a microhabitat is a specialized space with food, water, and shelter for
organisms to survive and interact with biotic and abiotic factors. An example of this habitat
includes a garden or between two rocks.
3. Biodiversity or Biological diversity, is the variety of life and the intricate interactions that
support and link organisms together in a geographical region.
4. If the biodiversity of an ecosystem is greater, then the sustainability will be greater allowing
that ecosystem to withstand environmental stress.
5. The biodiversity of an ecosystem depends on limiting factors,(both abiotic and biotic) or
factors that limit the ability of that habitat to sustain a population.
6. As groundwater moves through the soil/rocks, the limestone is broken down because of the
carbonic acid. The water can form sink holes or a cave.
7. Percolation or infiltration is the process by which water enters the small pore spaces between
particles of soil or rock.
8. What are the various components of an ecosystem?
The various components of an ecosystem are the abiotic and biotic factors. Abiotic factors
are non-living parts of the ecosystem, like the sun, weather, rocks, air, and water. Biotic
factors are the living parts of the ecosystem, like plants, animals, and insects.
9. How does biodiversity help sustain populations of organisms?
The biodiversity of an ecosystem contributes to the sustainablility of an ecosystem. The
higher the biodiversity, the higher the sustainability. The lower the biodiversity, the lower
the sustainability.
10. Write a story of a water drop moving through the ground including the following words, or
forms of the words. (soil/rock, water, carbonic acid, percolate, sink hole, cave, stalactite,
stalagmite, permeable, impermeable, recharge zone, aquifer)
11. What is the difference between Mechanical Weathering and Chemical Weathering? (List
examples of each type of weathering in complete sentences)
Mechanical weathering breaks rock down physically, and does not change the chemical
makeup of the rock. Examples are ice wedging, abrasion, and exfoliation. Chemical
weathering breaks rock down chemically, and changes the chemical makeup of the rock.
Examples are oxidation, acid rain, and carbonation.
12. Name 5 abiotic parts of the environment: sun, water, air, rocks, weather
13. Name 5 biotic parts of the environment: trees, animals, plants, grass, insects.
14. How do living parts of the environment rely on the non-living parts of the environment? (Give
specific examples)
Living parts of the environment rely on the non-living parts of the environment for drinking,
growth, and shelter. Plants need the sun in order to perform photosynthesis. They also need
water and carbon dioxide from the air. Animals require water to live. Some animals need
shelter under rocks, or borrow into the ground for shelter.
15. What is the difference between point-source and non-point source pollution? (give an example
of each in complete sentences)
Point source pollution is water pollution in which the source of the pollution can be traced,
or pointed out. Non-point source pollution is water pollution in which the source cannot be
traced or pointed out.
16. Why is an aquifer important for drinking water? (complete sentences)
An aquifer is important for drinking water, because the drinking water comes from the
aquifers. Aquifers are filled with water and are underground. Aquifers, while not .
completely protected from pollution, are normally less polluted than surface water.
17. What can happen to an aquifer if the recharge zone is polluted? (complete sentences)
If the recharge zone is polluted, then the polluted water will percolate into the aquifer. If
the polluted water percolates into the aquifer, the water in the aquifer will now be polluted.
18. What are the leading causes of erosion and deposition along the coast of Texas?
Wind and water
19. Is biodiversity considered a stabilizer of the environment? ___YES___ Does the loss of species
make the environment more stable? NO
20. When scientists talk about equilibrium in the environment, they are talking about
Balance of the environmental system……..High Biodiversity = High Sustainability
(Equilibrium means balance)
21. Why are factories placed strategically around or near towns that have watersheds?
Due to runoff, factories are placed downstream from towns and cities.
22. What caused the erosion of the canyons and several other deep caverns in the ecoregions of
the Texas panhandle? Wind and Water.
23. List 4 types of Surface Water:
1. Rivers/streams
3. Lakes
2. Ponds
4. Oceans
24. Draw and label a picture of groundwater and surface water meeting…include the water table