Its height (above mean sea level): metres
Its length: kilometres - or metres if it is a really short trail.
Tonnes
kilometre
It would be millimetres.
The kilogramme.
Kilometers
You would use meters. Or, if the trail is more than 1000 meters, you can use killometers
To measure a mountain range, the metric unit of measurement commonly used is meters. This unit allows for precise measurement of elevation and height, which are crucial for understanding the scale and prominence of the mountains. For very high mountains, such as those in the Himalayas, heights are often expressed in kilometers as well.
You would use the metric unit "liters" to measure the capacity of a hot water tank.
You would use kilograms (kg) to measure someone's mass in metric units.
You would typically use the metric unit of centimeters to measure the growth of your hair.
Metres
You would use liters (L) to measure the volume of a soda container in the metric system.
You would use the metric unit "kilograms" to measure the weight of a bag of groceries.
Potatoes are sold by the kilogram.
A thermometer.
distance
kilograms