What is this?
mountain
Which is higher? The mountain or the hill?
The mountain.
What is this?
Desert.
What is this?
river
What is this?
sea or ocean
What is this?
lake
Which is wider? The river or the stream?
The river.
In which of them water is saltier? In the lake or in the sea?
In the sea.
What is drier? The field or the desert?
The desert.
What is between the mountains?
valley
What is this?
Island.
What is this?
waterfall
What is this?
beach