Fish-

Amphibian-
Mammal-
Magma-
Lava-
Earthquake-
Tectonic Plates-
Ring of Fire-
Tsunami-
Tide-
Could you please give me the definitions in science terms?

FYI: For fish, from the linked-to site, use 2 of the defintions:

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1. Any of numerous cold-blooded aquatic vertebrates of the superclass Pisces, characteristically having fins, gills, and a streamlined body and including specifically:

a. Any of the class Osteichthyes, having a bony skeleton.

b. Any of the class Chondrichthyes, having a cartilaginous skeleton and including the sharks, rays, and skates.

...

3. Any of various primitive aquatic vertebrates of the class Cyclostomata, lacking jaws and including the lampreys and hagfishes.
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And do not use

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4. Any of various unrelated aquatic animals, such as a jellyfish, cuttlefish, or crayfish.
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They are not fish.

And if you are allowed to define something by including in the definition what it is not, then for an amphibian I'd define it as

amphibian: a non-amniote tetrapod.

Fish: Fish are aquatic vertebrates that have gills for respiration, fins for locomotion, and usually have scales covering their skin. They belong to the class of animals called Actinopterygii and are found in diverse habitats ranging from freshwater to marine environments.

Amphibian: Amphibians are cold-blooded vertebrates that typically live part of their lives in water and part on land. They usually undergo metamorphosis during their life cycle, transitioning from an aquatic larval form (such as tadpoles) to a terrestrial adult form. Amphibians breathe through their skin, lungs, or gills, depending on the stage of their life cycle.

Mammal: Mammals are a class of vertebrate animals characterized by the presence of mammary glands, which produce milk to nourish their young. They are warm-blooded and have hair or fur covering their bodies. Mammals give live birth and typically have internal fertilization.

Magma: Magma is molten rock found beneath the Earth's surface. It consists of a mixture of molten minerals, gases, and solid crystals. Magma is produced by the melting of rocks within the Earth's mantle and can erupt onto the surface as lava through volcanic activity.

Lava: Lava is molten rock that flows on the Earth's surface during a volcanic eruption. It is the result of magma that reaches the surface and is exposed to atmospheric pressure, gases, and cooling. Lava can vary in composition and viscosity, resulting in different types of volcanic eruptions and formations.

Earthquake: An earthquake is a sudden and violent shaking of the Earth's surface, caused by the release of tectonic stress accumulated within the Earth's crust. It occurs when there is a sudden movement or rupture along a fault line or within the Earth's layers. Earthquakes can cause ground shaking, surface displacement, and the generation of seismic waves.

Tectonic Plates: Tectonic plates are large rigid pieces of the Earth's lithosphere that fit together like puzzle pieces. They float on the semi-fluid asthenosphere beneath them. The movement and interaction of these plates result in various geological phenomena, such as earthquakes, volcanic activity, and the formation of mountain ranges.

Ring of Fire: The Ring of Fire is a major area in the basin of the Pacific Ocean where a large number of earthquakes and volcanic eruptions occur. It is a direct result of the movement and interaction of tectonic plates along the boundaries encircling the Pacific Plate. The Ring of Fire is a zone of high tectonic activity and is known for its seismic and volcanic hazards.

Tsunami: A tsunami is a series of ocean waves caused by underwater disturbances, such as earthquakes, volcanic eruptions, or landslides. These disturbances displace a large amount of water, which creates powerful, fast-moving waves that can travel across the ocean. Tsunamis can cause widespread destruction and loss of life when they reach coastal areas.

Tide: Tides are the periodic rise and fall of the Earth's ocean and other large bodies of water. They are caused by the gravitational pull of the Moon and the Sun, as well as the rotation of the Earth. Tides occur due to the gravitational attraction between these celestial bodies and the water, creating a cyclic pattern of water level changes.