HELP ASAP Which of these is a characteristic of warm air?

a It transfers energy through radiation.
b Its molecules are far apart.
c It sinks due to convection.
d It cools the land below it.

Which number represents a basic ph, 4 or 9? numerical answers expected! answer for blank 1: i'll give

The table presents the average day and night temperatures in five cities. it also reveals whether a city receives substantial rainfall (wet climate) or little rainfall (dry climate). which city’s rocks are likeliest to experience frost wedging, and why? a) city a because the consistently subzero temperature would prevent water from melting b) city b because it is a wet region and the temperature fluctuates around the freezing point c) city c because it receives plenty of rain fall and the weather is moderately cool d) city d because the hot and dry weather would cause rocks to absorb water

This is an active transport mechanism by which cells pump sodium and potassium ions against the concentration gradient