Answer:
State Route 7 (SR 7) is a major primary state highway and busy commuter route in northern Virginia, United States. It travels southeast from downtown Winchester to SR 400 (Washington Street) in downtown Alexandria. Its route largely parallels those of the Washington & Old Dominion Trail (W&OD Trail) and the Potomac River. Between its western terminus and I-395, SR 7 is part of the National Highway System.
Explanation:
Answer:
the climate became warmer and the desert expanded
Explanation:
The Sahel region is the region of ecoclimatic as well as biogeographic zone of the transition in the Africa between the Sudanian savanna to the south and Sahara to the north.
At around 2000 BCE, the agricultural techniques of the people of the Sahel region started spreading or diffusing to the other parts of the Africa due to the climate change. The climate became more arid and warmer gradually and the deserts also expanded in the region.
Answer:
A rock is a non-living earth material that is naturally formed. Rocks consist of mineral grain collections which are held in a solid mass.
Explanation:
Rocks are primarily identified by their minerals and texture. A distinctive mineral set is present in each type of rock. A rock may consist of grain, such as quartzite, of all minerals. More generally, a mix of various minerals consists of rocks. The texture is a description of mineral grain size, form, and arrangement.
Igneous Rocks:-
Cooling magma forms igneous rocks. Lava is magma that erupts on the surface of the earth. The chemical makeup of the magma and its refreshment speed determine how cool and crystallized rocks form, like minerals.
Sedimentary Rocks:-
By combining and cementing sediments, broken rock-like gravel, sand, silt, or clay rocks. Sedimentary rocks form.
The weathering and erosion of existing rocks can lead to the formation of those sediments. Chemical precipitates, which have been left behind by the liquor, are also included in sedimentary rocks.
Metamorphic Rocks:-
Metamorphic rocks occur when heat or pressures within the Earth change minerals in an existing rock.
Jupiter, Saturn, Uranus, and Neptune are classified as: gas giants, outer planets, and Jovian Planets.
