some places such as caves and sinkholes have lower elevations than surrounding areas infer how a sink might be shown on a topogr
aphic map
1 answer:
Answer:
By closed contours with hachures
Explanation:
A sinkhole is a depression in the ground that forms when water erodes an underlying rock layer.
Sinkholes are denoted by closed contours with tick marks (hachures) that point towards lower ground.
The topographical map below shows the difference between the contours of a hill and those of a sinkhole.
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Answer:
The tank with O₂ weighs more.
Explanation:
We can find the mass of gas using the ideal gas equation.
Considering the pressure (P), volume (V), temperature (T) and ideal gas constant (R) are the same, we can establish that:
m ∝ M
The mass is directly proportional to the molar mass. The molar mass of O₂ (32 g/mol) is higher than the molar mass of N₂ (28 g/mol). Therefore, the tank with O₂ weighs more.