Experimental Design
How many independent variables are there in a good experiment?
One
Mass measures
the amount of matter in an object
Latitude measures
north and south of the equator
A contour line on a map shows
What is an index contour?
A contour line that is darker in color and labeled with elevation.
The independent variable is
The factor that the experimenter changes on purpose
Volume measures
the amount of space occupied by matter
Longitude measures
east and west of the Prime Meridian
The contour interval on a map is
the change in elevation between two contour lines
Where is the International Date Line located?
(Give the longitude)
180 degrees of longitude
The dependent variable is
the factor that is influenced by the change in the IV; the data written down
When we measure density, we are measuring
how closely packed particles of matter are
The highest possible longitude on a map is
180 degrees
Your looking at a map and see closed contour lines (loops) in several places. What land feature is represented by the closed contour lines?
hill, peak of a mountain
How many time zones are there around the world?
24 time zones
What is a control?
The group that results are compared to, the plain group, the group that gets the standard amount
Fernando is out treasuring hunting and finds a small gold bar. The bar has a mass of 260 grams and a volume of 45 cubic centimeters. Find the density of the bar.
260 g divided by 45 cubic centimeters =
5.7 g/cm3
Each degree of latitude and longitude can be broken down into ________ minutes.
60
Your looking at a topographic map and notice closed contour lines (loops) that have tick marks on the inside of the loop. What are these ticks marks called and what do they represent?
hachures, they represent craters or basins
How do you find the gradient of an area?
Find the change in elevation between two points on the map, then divide by the distance between the two points.
Calista is conducting an experiment to determine how many fish eggs will hatch in different temperatures of water. She sets up four aquariums- one at 60 degrees, one at 70 degrees, one at 80 degrees, and the last at 85 degrees. She also adds different amounts of salt to the water. After two weeks, Calista counts the number of fry that have hatched in each tank. What is wrong with this experiment?
There should only be one independent variable. Too many variables are changed.
Brooklyn wants to measure the density of her silver ring to see if it is real. She drops the ring into a graduated cylinder, and the water level rises from 100 mL to 117 mL. The mass of the ring is 42 grams. What is the density of Brooklyn's ring?
2.47 g/cm3
Do lines of longitude meet? If so, where on the globe do they meet?
Yes, at the poles
When looking at a topographic map, how do you know which direction a river, stream, or creek flows?
The contour lines form a V when they cross a river or stream. The V points to the source of the water. Water flows in the opposite direction.
What is a benchmark?
A benchmark is a known point of elevation on a map. It is represented by a triangle with a number in it.