An engineer needs a material that can be easily rolled in to very thin sheets. Which type of material would best suit his needs?
Metal
100
A rural farmer needs to increase the amount of water available to his farm. What source of water would be easiest and least expensie for him to access?
Groundwater
100
Which of the following structures is responsible for breaking down waste materials in the cell?
Lysosomes
100
What is microbology?
The study of microorganisms
100
What was Pangaea?
The continents had once been joined in a huge supercontinent.
200
100 g iron + 43 g oxygen = ? rust
143 g
200
How much fresh water on Earth?
about 3%
200
What structure regulates the movement of water into and out of a cell?
Cell membrane
200
What does DNA stand for?
Deoxyribonucliec acid
200
What do index fossil help us determine?
The age of a fossil
300
Which type of change occurs when the size, shape, appearance, or volume of a substance is changed without changing its composition?
Physical
300
Which of the following sources of water would not contribute to the flowing in the river?
wetlands
300
Which structure provides the cell with energy?
Mitochondira
300
What is one of the steps of mitosis?
Chromosomes form
Chromosomes line up
Chromosomes separate
Nuclei form
300
What are the 3 type of original remains?
Ice
Amber
Tar
400
Which of the following elements, which is commonly encountered as a diatomic gas, makes up most of the earth's atmosphere?
nitrogen
400
What are the main parts of the water cycle?
•evaporation
•condensation
•precipitation
400
What is the function of the central vacuole?
The plant vacuole stores food, water, and wastes.
400
What do chromosomes have?
DNA
400
What are the Earth's Layers inside to the out?
Inner core
Outer core
Mantle
Crust
500
What are the 3 things that make up an atom?
Protons
Neutrons
Electrons
500
Why are swimming pools treated with chlorine?
To kill harmful organisms
500
What is one of the levels of organization?
Cell
tissue
organ
organ system
organism
500
What is a virus?
A virus is a small infectious agent that can replicate only inside the living cells of organisms.
500
What is one of the different types of fossils in rocks?
Molds and Casts
Petrified wood
Carbon flims
Trace fossils