Sedimentary rocks are formed by accumulation and hardening of sediments such as mud, sand, silt and disintegrated rocks over a period of time which are arranged in layers. Therefore we call them stratified rocks.

Main differences between systematic and regional approach are summarized below:

Systematic geography:-The study of a particular element in geography,such as agriculture and settlement,seeking to understand the processes which influence it and the spatial patterns which it causes.

Regional geography:-It is a major branch of geography.It focuses on the interaction of different cultural and natural geofactors in a specific land or landspace,while its counterpart,systematic geography.

A nebula is an interstellar cloud of dust, hydrogen, helium and other ionized gases. Originally, the term was used to describe any diffuse astronomical object, including galaxies beyond the Milky Way.

Nearly everything that a human does is in response to the environment. Our lives are defined by what is around us and what we find in front of us, whether this means accepting, dealing with or changing it. ... The shape of the land affected where humans moved.
 

Earthquake is a sudden violent shaking of the ground, typically causing great destruction, as a result of movements within the earth's crust or volcanic action.

Systematic geography :- The study of a particular element in geography,such as agriculture and settlement,seeking to understand the processes which influence it and the spatial patterns which it causes.

Regional geography :- It is a major branch of geography.It focuses on the interaction of different cultural and natural geofactors in a specific land or landspace,while its counterpart,systematic geography.

Difference between Gulf and straits
(i) Meaning: A gulf is a large body of water almost encircled by land except for a small mouth that opens out to the sea. A strait is a strip of water that separates two lands or two large bodies of water.
(ii) Use: Straits are used for navigational purposes and have played an integral part when it comes to shipping routes. Gulfs are more useful for human settlements, as such areas provide easy access to the ocean while being well protected as well.
(iii) Association: Gulfs can be easily associated with inland bodies of water as well as the ocean. Straits are mostly discussed with regards to the ocean.

Systematics is the study of the units of biodiversity.
Systematic errors are those errors which arises due to the repetition of same values due to fault im instruments. These errors tends to be in one direction either positive or negative. 

Check revision notes : https://mycbseguide.com/cbse-revision-notes.html

The concept of possibilism was propounded by Lucian Febure, who described that there are no necessities but possibilities everywhere and man is referred to as a master of these possibilities who judged their use. According to possibilism, man can adapt, adjust and modify the forces of his physical environment with his strength.
For instance, a health resort on highlands, huge urban sprawls (spread) fields, orchards and pastures in plains and rolling hills, ports on the coasts, oceanic routes on the oceanic surface and satellites in the space.

However, if a man will keep on exploiting nature for its selfish needs, a time will come when a man has to pay for his deeds. 

क्षेत्रीय निरंतरा मॉडल के अनुसार अनेक क्षेत्रों  में अलग- अलग मनुष्यों की उत्पत्ति हुई 

Geography is a field of science devoted to the study of the lands, features, inhabitants, and phenomena of the Earth and planets. The first person to use the word γεωγραφία was Eratosthenes.

STRUCTUREAND PHYSIOGRAPHY
(i) The Peninsular Block
(ii) The Himalayas and other Peninuslar Mountains
(iii) Indo-Ganga-Brahmaputra Plain.

THE PENINSULAR BLOCK Boundaries of the PENINSULAR BLOCK
1. The northern boundary of the Peninsular Block may be taken as an irregular line Movement of Indian plate running from Kachch along the western flank of the Aravali Range near Delhi and then roughly parallel to the Yamuna and the Ganga as far as the Rajmahal Hills and the Ganga delta. Apart from these,
2. The Karbi Anglong and the Meghalaya Plateau in the northeast and Rajasthan in the west are also extensions of this block.
3. The northeastern parts are separated by the Malda fault in West Bengal from the Chotanagpur plateau.
4. The Peninsula is formed essentially by a great complex of very ancient gneisses and granites,
5.Since the Cambrian period, the Peninsula has been standing like a rigid block with the exception of some of its western coast which is submerged beneath the sea and some other parts changed due to tectonic activity without affecting the original basement.
6. As a part of the Indo-Australian Plate, it has been subjected to various vertical movements and block faulting. The rift valleys of the Narmada, the Tapi and the Mahanadi and the Satpura block mountains are some examples of it.
The Peninsula mostly consists of relict and residual mountains like the Aravali hills, the Nallamala hills, the Javadi hills, the Veliconda hills, the Palkonda range and the Mahendragiri hills, etc.

THE HIMALAYAS AND OTHER PENINSULAR MOUNTAINS
1. The Himalayas along with other Peninsular mountains are young, weak and flexible in their geological structure unlike the rigid and stable Peninsular Block.
2. Consequently, they are still subjected to the interplay of exegetic and endogenic forces, resulting in the development of faults, folds and thrust plains.
3. These mountains are tectonic in origin, dissected by fast-flowing rivers which are in their youthful stage.
4. Various landforms like gorges, V-shaped valleys, rapids, waterfalls, etc. are indicative of this stage.

INDO-GANGA-BRAHMAPUTRA PLAIN
The third geological division of India comprises the plains formed by the river Indus, the Ganga and the Brahmaputra.
It was a geo-synclinal depression which attained its maximum development during the third phase of the Himalayan mountain formation approximately about 64 million years ago.
Since then, it has been gradually filled by the sediments brought by the Himalayan and Peninsular rivers.
Average depth of alluvial deposits in these plains ranges from 1,000-2,000 m.

MANTLE: A mantle is a layer inside a planetary body bounded below by a core and above by a crust. Mantles are made of rock or ices, and are generally the largest and most massive layer of the planetary body. Mantles are characteristic of planetary bodies that have undergone differentiation by density.

CORE: Earth's inner core is the innermost geologic layer of the Earth. It is primarily a solid ball with a radius of about 1,220 kilometres, which is about 20% of the Earth's radius or 70% of the Moon's radius. There are no samples of the Earth's core available for direct measurement, as there are for the Earth's mantle.

Physical geography includes the study of lithosphere (landforms, drainage, relief and physiography), atmosphere (its composition,structure, elements and controls of weather and climate; temperature, pressure, winds,precipitation, climatic types, etc.),hydrosphere(oceans, seas, lakes and associated features with water realm) and biosphere ( life forms including human being and macro-organism and their sustaining mechanism, viz. food chain, ecological parameters and ecological balance).

The study of physical geography is emerging as a discipline of evaluating and managing natural resources. In order to achieve this objective, it is essential to understand the intricate relationship between physical environment and human beings. Physical environment provides resources, and human beings utilise these resources and ensure their economic and cultural development. Accelerated pace of resource utilisation with the help of modern technology has created ecological imbalance in the world. Hence, a better understanding of physical environment is absolutely essential for sustainable development.