Blocking.
The center of a dart board is called the bullseye. It is typically worth the most points and is surrounded by the inner bullseye and outer bullseye.
space, or outer space
Breakthru
Sheathing is a layer of boards or of other wood or fiber materials applied to the outer studs, joints, and rafters of a building to strengthen the structure.
The strong lower part of the mantle between the asthenosphere and the outer core is called the lower mantle. The layer of the atmosphere between the stratosphere and the thermosphere is called the mesosphere.
Space Board Game
The red and green at the center of a dartboard is called the bulls eye. Other parts of the board include the double ring, triple ring, and outer ring.
9 k
The layer between the inner core and the mantle is called the outer core. It is composed of molten iron and nickel, which generates Earth's magnetic field through convection currents.
1 by 1
electronegativity
Formation of covalent bonds.