(a) 3,200 km

(b) 6,400 km  ✅

(c) 9,600 km

(d) 12,800 km

(a) Cluster of islands ✅

(b) Rocks under seas

(c) Cluster of small states

(d) Cluster of stars

(a) 1,000 degrees Celsius

(b) 2,000 degrees Celsius ✅

(c) 1,200 degrees Celsius

(d) 2,600 degrees Celsius

(a) Conduction

(b) Convection

(c) Radiation ✅

(d) Reflection

(a) Australia ✅

(b) China

(c) U.S.A.

(d) Canada

(a) English

(b) Latin

(c) Chinese

(d) Japanese ✅

(a) Anthracite ✅

(b) Bituminous coal

(c) Lignite

(d) Peat

(a) Australia

(b) France

(c) U.S.A.

(d) Chile ✅

(a) Germany

(b) France

(c) China ✅

(d) U.S.A.

(a) English

(b) China

(c) USA ✅

(d) Russia

(a) Community of plant species coexisting in a specific environmental context

(b) Compilation of plants within a designated area or time, categorized by species and considered as a group ✅

(c) Expansive area populated by trees and shrubs, managed for economic evaluation

(d) Functionality of animal species in preserving ecological equilibrium

(a) Grand masses

(b) Equatorial region ✅

(c) Water bodies

(d) Tropical desert

(a) 47%

(b) 51% ✅

(c) 66%

(d) 100%

(a) Ionosphere ✅

(b) Troposphere

(c) Stratosphere

(d) Ozone layer

(a) Aluminium

(b) Iron

(c) Platinum

(d) Thorium ✅