one
Groundwater is always underground!
The two types of groundwater are shallow groundwater and deep groundwater. Shallow groundwater is found closer to the surface, typically within the first few hundred feet of the Earth's surface. Deep groundwater is located deeper underground, often thousands of feet below the surface.
Two possible sources of groundwater contamination are agricultural runoff, which can carry pesticides and fertilizers into groundwater sources, and leaking underground storage tanks, which can release harmful chemicals into the groundwater.
Two threats to groundwater are contamination from pollutants such as chemicals, pesticides, and fertilizers leaching into the groundwater from the surface, and over-extraction of groundwater leading to depletion of water reserves. Both can have serious consequences for drinking water quality and ecosystem health.
It is used as one word.
no it is not an one word it is of two word
Hipbone is one word.
I think the word "ongoing" is only one word, but it has two syllables that are two separate words.
The word "hairbrush" is typically written as one word, not two.
It is one word.
one word
One word, two syllables