The living world: Tropical rainforests - Nutrient Cycle

Question 1

Litter

Answer 1

Layer of vegetation on surface of soil. Biggest circle.

Question 2

Biomass

Answer 2

Plants and organisms. Middle circle.

Question 3

Nutrient cycle

Answer 3

Arrow into soil - some nutrients added as rock is weathered
Arrow out of soil - some nutrients lost due to leaching
Arrow from soil to biomass - nutrients taken up by plants
Arrow from biomass to litter - plants and organisms die
Arrow from litter to soil - nutrients released as plants rot (decompose)

Question 4

Soil

Answer 4

Smallest circle.