cells and body systems
What is the job of the vacuole?
to store nutrients, water and waste
why do we see different moon phases?
because of the changing position of the earth and moon in relation to the sun / because the earth and moon revolve around the sun
Describe the law of superposition?
Older rock layers are found at the bottom - younger rock layers are on top
what tool do you use to measure liquid volume and what is the base unit?
graduated cylinder and liter
which of these is a physical change?
1. changes from solid to a liquid
2. creates a new substance
3. gives off heat
change from solid to liquid
what is the base unit of mass
gram
which movement is involuntary?
1. running
2. heart beating
3. writing in a journal
heart beating
how long does it take for the earth to revolve once around the sun?
1 year
which of Earth's 4 layers is liquid?
the outer core
you're giving 5 plants different amounts of water but the same size pots, amount of sunlight, and soil type. Then you measure the growth over 3 weeks. What is the independent variable?
the amount of water given to each plant (different amounts)
What type of mixture is blood an example of?
homogenous mixture
what is the job of the golgi body?
to package things
which cells have a nucleus and membrane-bound organelles?
1. eukaryotic cells
2. prokaryotic cells
3. Bacteria cells
eukaryotic cells
what happens because of Earth's tilt?
seasons
two tectonic plates sliding away from each other is called.....
diversion
if an object floats in water, what do you know about its density?
It is smaller than/less than 1
when light bounces off a material, it is called.....
reflection
what determines volume of a sound wave?
the amplitude
what organelle is the passageway throughout the cell?
1. ER
2. ribosome
3. golgi body
ER
what two forces work together to keep planets in orbit?
gravity and inertia
what fossils are really good time markers?
index fossils
what is the method called where you use graduated cylinders to measure irregular solid objects?
1. evaporation
2. water displacement
3. condensation
water displacement
the material that a wave travels through is called ____
a medium
what two organelles are ONLY found in plant cells?
chloroplast and cell wall
What 2 body systems help take in oxygen and transport it to the cells?
the respiratory and the circulatory system
how will your mass and weight be affected if you travel to the moon?
your mass will stay the same, but your weight will change due to the different gravity on the moon
What are 3 pieces of evidence to support Pangaea?
1. same fossils in places far apart
2. continents fit like puzzle pieces
3. climate/glaciers
what are the steps to determine the identity of an unknown mystery rock you find?
1. find the mass (scale) and the volume (water displacement)
2. calculate the density and compare it to other known densities of rocks
sound waves are examples of what type of waves?
mechanical and longitudinal waves
what is the difference between an observation and an inference?
observation = facts
inference = educated guess based on facts