40) which one of the following statements is believed to be true of comets? a) they have highly elliptical orbits around the sun. b) they are composed mostly of dense rock particles. c) they may gain slightly in mass with each orbit around the sun. d) their bright, glowing appearance in the night sky is due to frictional heating atmosphere. diff: 1

The correct statement for comet is - ( a ) They have highly elliptical orbits around the sun

Explanation:

The comet is made up by the composition of dust , water , ice , rock and frozen gases like , the carbon dioxide , methane , ammonia and carbon monoxide .

Comet shows a process called outgassing , i.e. , the comet passes close to the sun , then they start to release gases , which is visible in the form of a comet's tail .

The comet and its tail glows by the sun and becomes visible when the comet passes through the solar system , because the dust partials reflects sunlight directly and the gas glows due to ionization process.

The orbital of comet is usually highly eccentric elliptical path .

there's multiple reasons why the conquistadors were so successful in colonizing central america, and some of them are:

- they were seen as gods;

at the beginning, the spanish settlers were seen by the natives as gods, and this was mainly due to their white skin, and the way they came with their boats.

- possessed superior weaponry;

the spanish had gunpowder and guns, as well as cannons, while the natives did not had any fire weapons.

- made cleaver alliances;

they used the situation of tribes hating each other, so they made alliances with some of them which served them very well.

- brought diseases;

the native people were not immune to certain diseases the europeans brought with them, so they were dying from seeming harmless things for european standards.