Ruler
Diameter tools
a balance
gramsWHAT
a balance
they used wood tools and steel tools and rock or stone tools
a rock knif
hydrophone
either use feet or meters. use a tape measure or a meter stick (yard stick)
You use a graduated cylinder to measure the volume of the rock with the water and the water without the rock
They use tools and measure earth again with the help of scientific tools
safety measure
Hydrologist use water meters to measure the flow of the water