_________ occurs in rivers when rocks are worn away by the moving water.
Erosion
Mud
Settling
Irritation
___________ can turn large mountains into small hills over time.
Friction
Sandpaper
Bacteria
Weathering
This ice __________ was created by years of water dripping down and freezing.
house
sculpture
icicle
formation
We hiked up the mountain and walked along the cold ice of the _________.
refrigerator
island
ground
glacier
Thick layers of _________ can build up in rivers and lakes.
fish
water
sediment
mud
Lava slowly filled _________ that were created by impacts of massive asteroids more than three billion years ago.
bowls
holes
tunnels
basins
The healthy tree withered and ___________ because bugs had eaten away the bark.
deteriorated
fell down
died
stretched
That is ____________ ink, so the stain will never go away.
blue
tough
dry
permanent
A man at the store ________________ how to use the sharp knives that were for sale.
told
tested
copied
demonstrated
The metal gate __________ the cars from entering the parking lot.
turned
broke
allowed
prevented
