What causes convection currents in earth

Convection currents are the result of differential heating. Lighter (less dense), warm material rises while heavier (more dense) cool material sinks.

as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.

a

explanation:

many plants naturally reproduce this way, but it can also be induced artificially. horticulturalists have developed asexual propagation techniques that use vegetative plant parts to replicate plants. success rates and difficulty of propagation vary greatly. monocotyledons typically lack a vascular cambium and therefore are harder to propagate.