2.

rocky planets have a higher proportion of heavier elements, like iron and nickel, and minerals than the gas giants.

true

false

True

Explanation:

The rocky planets are the terrestrial planets these are composed of rocks, within the rocks hard metals core is present which is composed of metals like iron, nickel and other mineral metals. The example of rocky planets includes the Earth.

A gas giant is a giant planet which is composed mainly of gases like helium and hydrogen. Jupiter and Saturn are the gas giant planets of the solar system.

the wrong statement is - c. a desert had more biodiversity than a marsh.

the deserts are one of the places of the planet where there's the least biodiversity. the reasons for that are the climate and the lack of food sources, which hampers both the number of the species that can survive in it, and the number of the individuals in the species itself.

the marshes, on the other hand, are places where there's perfect conditions for lots of organisms to thrive. the temperature is moderate and nice, the amount of water and the food sources are on a high level, so there's an abundance of both plant and animal life in them.

heat released by collision processes during accretion, and heat from decay of radioactive elements

explanation: