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