Air thermals are updrafts of warm air that rise from the ground into the sky. By flying in a spiral pattern
birds are able to ride these air currents to higher
altitudes.

What process enables birds to fly to higher altitudes without flapping their wings,
while riding these air thermals?

A. convection because warm air sinks and cool air rises.

B. convection because warm air rises and cool air sinks.

C. conduction because warm air sinks and cool air rises.

D. conduction because warm air rises and cool air sinks

B. convection because warm air rises and cool air sinks.

Explanation:

The processes that enables birds to fly to higher altitudes without flapping their winds while riding air thermals is called convection.

Convection is one of the forms of heat transfer usually found in gases and liquids.

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms