_________ occurs in rivers when rocks are worn away by the moving water.
Erosion
Irritation
Mud
Settling
___________ can turn large mountains into small hills over time.
Friction
Weathering
Bacteria
Sandpaper
This ice __________ was created by years of water dripping down and freezing.
house
formation
icicle
sculpture
We hiked up the mountain and walked along the cold ice of the _________.
island
refrigerator
glacier
ground
Thick layers of _________ can build up in rivers and lakes.
sediment
water
fish
mud
Lava slowly filled _________ that were created by impacts of massive asteroids more than three billion years ago.
bowls
tunnels
holes
basins
The healthy tree withered and ___________ because bugs had eaten away the bark.
stretched
deteriorated
fell down
died
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.
demonstrated
copied
tested
told
The metal gate __________ the cars from entering the parking lot.
turned
prevented
allowed
broke
