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mid term exam
7th grade science mid term
31
Science
7th Grade
12/16/2008

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Cards

Term
Newton's first law of motion
Definition
an object at rest will remain at rest unless acted on by an ubalanced force. an object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
Term
Newton's second law of motion
Definition
acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object).
Term
F= MA
Definition
Force+ Mass times acceleration
Term
Newton's third law of motion
Definition
for every action there is an equal and opposite re-action.
Term
What is igneous rock made from?
Definition
molten rock/magma
Term
What are some examples of igneous rock?
Definition
Granite, pumice, obsidian
Term
How is sedimentary rock formed?
Definition
The weathering or erosion of suface rock, which is compacted/cemented together by layering of sediments.
Term
Most fossils are located in what kind of rock?
Definition
limestone and other sedimentary rocks
Term
how is metamorphic rock formed?
Definition
when igneous or sedimentary rock undergo enough pressure and heat that it changes into another form . It morphs.
Term
What is an example of metamorphic rock?
Definition
slate, it started out as shale.
Term
What is succession?
Definition
succession is a gradual and progressive development of land in an ecosystem
Term
What is the difference between primary and secondary succession?
Definition
Primary occurs following an opening of a pristine habitat. Secondary is a response to disturbance such as a forest fire.
Term
What three main stages are in the water cycle?
Definition
evaporation, condensatiion and precipitation
Term
What type of energy causes water to evaporate?
Definition
thermal heat energy
Term
What is the relationship between each step in the level of organization?
Definition
cells, tissue, organ ,organ system, organism, population, community, ecosystem
Term
what is the difference between unicelular and multicellular organizms?
Definition
Unicellular organisms can be a population and can live independently of other cells. Multicellular organisms need to be attached to other tissues in order to survive, and cannot live independently
Term
four common characteristics that all cells have in common
Definition
cell membrane, cytoplasm and organelles, hereditary material, small size
Term
two differences between plant and animal cells
Definition
cell wall, chloroplasts, large vacuole is only in plant cells
Term
why are cells small?
Definition
Smaller cells are able to get materials into and out of the cell faster than larger cells.
Term
differences between prokaryotic and eukaryotic cells
Definition
pro cells have no nucleus
pro cells have circular dna
eu cells have membrane-covered organelles
eu cells have linear dna
Term
nucleus
Definition
brain of cell contains dna
Term
cell wall
Definition
gives plant cells rigid structure
Term
cell membrane
Definition
keeps good materials in, bad ones out
Term
vacuole
Definition
stores water or nutrients or waste
Term
chloroplasts
Definition
allows plants to do photosynthessis
Term
ribosomes
Definition
make proteins
Term
Endoplasmic reticulum
Definition
network of roads throughout the cell
Term
lysosome
Definition
contains enzymes to speed up digestion
Term
mitochondria
Definition
make food into atp
Term
cytoplasm/cytosol
Definition
the soup in which all the organelles float
Term
golgi
Definition
packages supplies for transport
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