Rock (geology) - Wikipedia
Rocks form the Earth's outer solid layer, the crust, and most of its interior, except for the liquid outer core and pockets of magma in the asthenosphere. The study of rocks involves multiple subdisciplines of geology, including petrology and mineralogy.

Rock | Definition, Characteristics, Formation, Cycle, Classification ...
Rocks are commonly divided into three major classes according to the processes that resulted in their formation.

Rocks: Pictures of Igneous, Metamorphic and Sedimentary Rocks
Rocks hold the history of the earth and the materials that will be used to build its future. Igneous Rocks: Photos, descriptions and facts about intrusive and extrusive igneous rocks. Metamorphic Rocks: Photos, descriptions and facts about foliated and non-foliated metamorphic rocks.

Rocks - Geology (U.S. National Park Service)
Rocks are all around us. They make up the backbones of hills and mountains and the foundations of plains and valleys. Beneath the soil you walk on and the deep layers of soft mud that cover the ocean basins is a basement of hard rock. Rocks are made up of different minerals, broken pieces of crystals, or broken pieces of rocks.

Rocks: Types, Formation, Classification & Rock Cycle
Explore the three main types of rocks—igneous, sedimentary, and metamorphic. Learn how rocks form, how to identify them, and how the rock cycle works. Kopyala

What Is Rock? Types of Rocks, Their Formation, and Complete Geological ...
Types of Rocks, Their Formation, and Complete Geological Classification. When a rock enters the metamorphic environment, it begins a slow but profound transformation. Heat increases, pressure rises, minerals dissolve and re-crystallize, grains rotate,...

Rocks and Minerals - Geology (U.S. National Park Service)
Ask the federal government anything. Learning about rocks and minerals gives students a deeper appreciation of the story behind the scenery in our national parks. Introduction Rocks and minerals are all around us! They help us to develop new technologies and are used in our everyday lives. Our use of rocks and minerals includes as building material, cosmetics, cars, roads, and appliances. In ...

Introduction to Rocks — Earth@Home
Introduction to the different types of rocks, their classification, and the rock cycle.

Introduction to Rocks: Types, Formation, Characteristics, and Uses
Rocks are naturally occurring solid materials that make up the Earth’s crust. From a scientific and geographic perspective, a rock is an aggregate of one or more minerals that have formed through geological processes over long periods of time.

Rocks and minerals - British Geological Survey
What is a rock? A rock is a solid collection of minerals. There are three main types of rock, classified by how they are sourced and formed: The rock cycle.

1. Juniper (Juniperus spp.) — Outdoor
   Iconic needle-like foliage, highly pliable branches ideal for wiring, and extreme cold hardiness.
2. Ficus / Ginseng Ficus (Ficus retusa / microcarpa) — Indoor
   Thick, glossy leaves, striking aerial roots, and forgiving water tolerances. Excellent starter tree.
3. Japanese Maple (Acer palmatum) — Outdoor
   Delicate lobed leaves with dramatic seasonal color shifts from bright green to deep reds and oranges.
4. Chinese Elm (Ulmus parvifolia) — Outdoor / Semi-Indoor
   Small leaves, fine branch ramification, and rapid growth that responds very well to frequent pruning.
5. Dwarf Jade (Portulacaria afra) — Indoor / Warm Outdoor
   Succulent leaves and thick woody trunks. Highly resilient against occasional underwatering.
6. Japanese Black Pine (Pinus thunbergii) — Outdoor
   Classic coniferous bonsai featuring rugged bark, sharp green needles, and strong trunk movement.
7. Satsuki Azalea (Rhododendron indicum) — Outdoor
   Famous for spectacular spring flowering displays in pink, red, and white alongside small evergreen leaves.
8. Fukien Tea (Ehretia microphylla) — Indoor
   Shiny textured leaves, tiny white flowers blooming year-round, and dark textured bark.
9. Cotoneaster (Cotoneaster spp.) — Outdoor
   Compact foliage, delicate white or pink spring blooms, and bright red autumn berries.
10. Boxwood (Buxus spp.) — Outdoor / Semi-Indoor
    Dense foliage, naturally tiny oval leaves, and tough hardwood bark. Extremely hardy.