Tropical Evergreen Forest:
Tropical evergreen forests, also known as tropical rainforests, are found in regions near the equator. These forests are characterized by high rainfall throughout the year, high humidity, and a constant temperature. Here are the key features that distinguish tropical evergreen forests:

1. Climate: Tropical evergreen forests have a hot and humid climate with high temperatures ranging between 20°C to 30°C throughout the year. The annual rainfall in these forests exceeds 200 cm, providing a conducive environment for the growth of dense vegetation.

2. Vegetation: These forests are characterized by a dense and multi-layered canopy formed by tall trees that can grow up to 60 meters in height. The canopy prevents much sunlight from reaching the forest floor, resulting in limited undergrowth. The trees have broad and dark green leaves, which help in the process of photosynthesis even in low light conditions.

3. Biodiversity: Tropical evergreen forests are known for their high biodiversity. They are home to a wide variety of plant and animal species, including numerous endemic and endangered species. These forests are often referred to as the "lungs of the Earth" due to their vital role in carbon sequestration and oxygen production.

4. Soil: The soil in tropical evergreen forests is rich in nutrients but lacks organic matter due to the rapid decomposition of fallen leaves and other organic materials. The constant rainfall leaches away the nutrients from the soil, making it less fertile.

Thorn Forest:
Thorn forests, also known as tropical dry forests or deciduous forests, are found in regions with a distinct dry season. They are characterized by a scarcity of water and adapted vegetation to survive in arid conditions. Here are the key features that distinguish thorn forests:

1. Climate: Thorn forests have a distinct dry season, with rainfall ranging from 25 to 75 cm annually. The temperature in these regions can vary greatly, with hot summers and cooler winters. The dry season may last for several months, leading to water scarcity.

2. Vegetation: Thorn forests are characterized by short and thorny trees, shrubs, and thorny grasses that have adapted to the arid conditions. The trees shed their leaves during the dry season to conserve water. The thorns act as a defense mechanism against herbivores and help reduce water loss through transpiration.

3. Biodiversity: Thorn forests have a lower biodiversity compared to tropical evergreen forests. However, they support a variety of specialized plant and animal species that are adapted to survive in arid conditions. Some examples of animals found in thorn forests are camels, antelopes, and desert foxes.

4. Soil: The soil in thorn forests is generally sandy and well-drained, with low water retention capacity. It is often nutrient-poor and lacks organic matter. However, during the brief rainy season, the soil can become temporarily fertile, supporting the growth of vegetation.

In conclusion, tropical evergreen forests thrive in a hot and humid climate with high rainfall, while thorn forests adapt to arid conditions with a distinct dry season. The vegetation, biodiversity, and soil characteristics differ significantly between these two types of forests.