Show:
SEASONS/TIDES
MOON/TIDES
TIDES/CHEM
REACTIONS
CHEM/CONV
LAYERS
100
Why does the earth have seasons?
due to the tilt of the Earth's axis.
100
The phases of the moon are caused by?
the lunar cycle.
100
Can scientists predict tides?
yes, very accruately. You can find tide tables in the newspaper of cities near the ocean.
100
What is a precipitate?
A solid that forms from a chemical reaction.
100
What is a synthesis reaction?
A synthesis reaction is a chemical reaction where two simple substances combine to form one more complicated substance. (+ -->) A decomposition reaction is a chemical reaction where one more complicated substance decomposes to create two simpler substances. (--> +) A replacement reaction is a chemical reaction where two or more substance exchange elements to become two or more new substances.
200
Where does Earth's axis ALWAYS point?
towards the North Star (Polaris)
200
Why is the moon lit?
It reflects light from the sun. The moon is not a source of light.
200
What type of energy do tides have?
Potential (stored)
200
What is the only SURE evidence of a chemical reaction?
The creation of a new substance. Changes in physical properties (like change of state of matter, color change) are only evidence. Not proof.
200
What is convection?
Convection is the transfer of heat by movement of heated fluid. Convection drives weather and plate tectonics.
300
In which season are there direct rays and longer days?
Summer has direct rays and longer days. Winter has indirect rays and shorter days.
300
What are the two types of tidal cycles?
daily and monthly.
300
What are valence electrons?
Electrons that are loosely held, in the outer energy level and are involved in bonding? Electrons orbit the nucleus, have a negative charge and almost no mass. The nucleus contains the protons and neutrons. Protons have a positive charge, and neutrons have a neutral charge. The nucleus has almost all of the mass of the atom.
300
What happens to energy during a chemical reaction?
It is either absorbed or released. It is absorbed in an endothermic reaction and released in an exothermic reaction.
300
Where do you find the newest ocean floor?
The newest ocean floor is closed to the mid-ocean ridge. The older ocean floor is nearest the trenches. After each eruption, the floor is pushed to the side and eventually moves away from the mid-ocean ridge and toward the trenches, where it will be subducted into the mantle.
400
The daily rise and fall of the Earth's waters are called?
tides, which includes ALL bodies of water, not just large ones.
400
How is the MODERN periodic table arranged?
The elements on the periodic table are in order of increasing atomic number. The atomic number is equal to the number of protons and electrons.
400
What is a chemical equation?
A chemical equation is a shorter, easier way to show a chemical reaction, using symbols instead of words. Chemical formulas are the "recipe" for a substance. For example, H20 is the chemical formula for water.
400
What is the correct order of the layers of the Earth? (from outer most to inner most)
The crust is the outer most layer. It is part of the lithosphere and includes the moving plates. Continental crust is made of granite and most oceanic crust is made of basalt. The mantle is a thick layer of hot magma. The upper portion is included in the lithosphere and the rest is included in the asthenospher. Convection currents in the mantle are responsible for plate movement. The outer core is a layer of molten iron and nickel. The convection currents with in the outer core help create the Earth's magnetic field. The inner core is a hard, dense layer of iron and nickel. The convection currents in the outer core cause the inner core to spin at a different rate than the Earth spins, thus creating the Earth's magnetic field.
500
Tides are caused by the interaction of these three things?
sun, moon and earth
500
How often are high tides?
12 hours and 25 minutes. Low tides are 12 hours and 25 mintues apart too!
500
What can you predict from an elements location on the periodic table?
It's properties. Metals take up most of the table from the left. The non-metals are on the right. The metalloids are between metals and non-metals. The elements become more stable as they move inward from the right and left sides, except for the gases in group 18, which hardly ever react with other substances.
500
What is the principle of conservation?
Matter is not created or destroyed.
500
During convection, what happens to the movement of a fluid if the heat source is removed?
During convection, heat rises and cool sinks. If the heat source is removed, the current will eventually stop.