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