the density of earth’s crust is
1)less than the density of the outer core but greater than the density of the mantle
2)greater than the density of the outer core but less than the density of the mantle
3)less than the density of both the outer core and the mantle
4)greater than the density of both the outer core and the mantle

Option  (3)

Explanation:

The earth's interior is divided into 3 parts, namely the crust, core and mantle.

The core is the interior part of the earth and are classified as the inner and the outer core. Both are comprised of hot denser rocks. The density of the inner core is about 13 g/cm³ and the density of the outer core is about 11 g/cm³.

The mantle is the middle portion of the earth in which the convection current forms. The average density of the mantle, including both upper and lower mantle, is 4.5 g/cm³.

The crust is the outer hard layer that is made up of the solid rocks. The density of crust is about 2.5 g/cm³, being the least dense, compared to the rest of the layers of the earth's interior.

Thus, the correct answer is option (3).

1)

i))the process of preparing food by green plants in the presence of sunlight is called photosynthesis.

ii) leaf is the site for photosynthesis.

iii) it takes place as,

6h2o+6co2=c6h12o6+602