Final answer:
The Amazon Basin and the Congo Basin are the top two tropical forest blocks, known for their size and biodiversity, but facing severe deforestation threats.
Step-by-step explanation:
The top two tropical forest blocks of the world are the Amazon Basin in South America and the Congo Basin in Central Africa. These forest blocks are known for their immense size and significant biodiversity, representing the most extensive areas of tropical forest left on the planet. The Amazon Basin is renowned for being the largest tropical rainforest, hosting a variety of ecosystems and being home to an abundance of wildlife. Equally important is the Congo Basin, which is the second-largest tropical rainforest in the world and a vital ecological hub for the continent of Africa.
Unfortunately, these critical ecosystems face severe threats due to deforestation. Activities such as slash-and-burn farming, unsustainable logging, and the expansion of agricultural land are leading to the rapid loss of these forests. Despite the deforestation challenges, protective measures and global awareness are crucial in preserving the remaining forest cover and biodiversity.